How to install Yosemite on erased external HD under El Capitan.

[PaulRanger2]

[FONT=Open Sans, sans-serif, Arial]Hello all,[/FONT]
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[FONT=Open Sans, sans-serif, Arial]My current configuration is iMac 10,1 21.5" (late 2009) running OS X 10.11.4.[/FONT]
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[FONT=Open Sans, sans-serif, Arial]I've erased a 2TB external drive (now Mac OS Extended [Journaled]) and tried to use "Install OS X Yosemite" from within the "Applications" folder. A warning window appears saying - This copy of the "Install OS X" application is too old to be opened on this version of OS X.[/FONT]
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[FONT=Open Sans, sans-serif, Arial]Opening "App Store" and clicking "Purchased" shows "OS X Yosemite" - 18 October 2014 - "Downloaded" button is inactive.[/FONT]
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[FONT=Open Sans, sans-serif, Arial]Is there any way I can download the Yosemite installer "Install OS X Yosemite.app" or a .dmg file and install Yosemite on the 2TB external drive, please?[/FONT]
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[FONT=Open Sans, sans-serif, Arial]Sincerely, [/FONT]

 

[Gjwilly]

Apple changed the signing of their apps, so yes, older installers will no longer work and must be updated.
I'm guessing that the download button in the App store is inactive because you've still got the old installer in your Applications folder. If you delete it (or move it) I'll bet that you'll then be able to download the updated installer.
Once you have the installer you can use it to make a bootable USB drive, then boot from the USB drive and install Yosemite to the external drive.

http://www.macworld.com/article/236...otable-os-x-10-10-yosemite-install-drive.html

 

[PaulRanger2]

Apple changed the signing of their apps, so yes, older installers will no longer work and must be updated.
I'm guessing that the download button in the App store is inactive because you've still got the old installer in your Applications folder. If you delete it (or move it) I'll bet that you'll then be able to download the updated installer.
Once you have the installer you can use it to make a bootable USB drive, then boot from the USB drive and install Yosemite to the external drive.

http://www.macworld.com/article/236...otable-os-x-10-10-yosemite-install-drive.html

Thank you, GJwilly, for your kind response. I copied the "Install OS X Yosemite" to desktop as you suggested and deleted same from "Applications" folder. However, reopening App Store still shows OS X Yosemite - 18 October 2014 ' Downloaded (Inactive). I do not want to download the updated OS X installer if that installs the troublesome El Capitan only, without Yosemite as alternative OS X.

I have Yosemite installed on an external HD BUT, after rebooting with that system active, that 10.10.3 system will not recognise any user (even when selected from the Get Info panel which shows all users as having Read AND Write privileges) and/or a known changed password. The App Store in that System (10.10.3) Application still shows "Downloaded" button still as inactive.

I want to download the "Install OS X Yosemite' file as a dmg (with either 10.11.4 Mac HD or 10.10.3 external HD being active) which I will drag onto the blank but formatted 2TB external drive.

With El Capitan (stupid name) as my default active OS X on my Mac HD, many non Apple applications will not work. I cannot afford to pay for new versions of software I have already purchased. Some developers may eventually provide 10.11.4 compliant updates, repeat MAY. Other excellent open source software (e.g. MPEGStreamclip) are no longer supported, worked fine under Yosemite but have to be sacrificed to use El Capitan.

If I can download the Yosemite dmg file (with 10.11.4 active) and then install Yosemite from the Mac HD by dragging the dmg file to the 2TB blank external, I will have restored faith in Apple as a consumer conscious computer supplier.
Thank you again.

Sincerely, PaulRanger2.

 

[PaulRanger2]

Thank you, GJwilly, for your kind response. I copied the "Install OS X Yosemite" to desktop as you suggested and deleted same from "Applications" folder. However, reopening App Store still shows OS X Yosemite - 18 October 2014 ' Downloaded (Inactive). I do not want to download the updated OS X installer if that installs the troublesome El Capitan only, without Yosemite as alternative OS X.

I have Yosemite installed on an external HD BUT, after rebooting with that system active, that 10.10.3 system will not recognise any user (even when selected from the Get Info panel which shows all users as having Read AND Write privileges) and/or a known changed password. The App Store in that System (10.10.3) Application still shows "Downloaded" button still as inactive.

I want to download the "Install OS X Yosemite' file as a dmg (with either 10.11.4 Mac HD or 10.10.3 external HD being active) which I will drag onto the blank but formatted 2TB external drive.

With El Capitan (stupid name) as my default active OS X on my Mac HD, many non Apple applications will not work. I cannot afford to pay for new versions of software I have already purchased. Some developers may eventually provide 10.11.4 compliant updates, repeat MAY. Other excellent open source software (e.g. MPEGStreamclip) are no longer supported, worked fine under Yosemite but have to be sacrificed to use El Capitan.

If I can download the Yosemite dmg file (with 10.11.4 active) and then install Yosemite from the Mac HD by dragging the dmg file to the 2TB blank external, I will have restored faith in Apple as a consumer conscious computer supplier.
Thank you again.

Sincerely, PaulRanger2.

Hello again GJwilly,

I have downloaded "Yosemite.iso" onto active internal HD which is 5.5GB. Double clicking the icon opens a window on desktop entitled "Yosemite Zone" contains cartoon figures and the wording "HACKINTOSH ZONE.
Opening File/Burn Yosemite Zone to disk opens warning window "Are you sure you want to create an empty disc? "Yosemite Zone" doesn't appear to have any contents, so the disc will be empty. Cancel/Continue".
Get Info on the "Yosemite Zone" icon shows the file as being 5.49GB in size. ????

I restarted pressing option key and chose external 500GB 10.10.3 as active system.
I downloaded "Yosemite.dmg" onto the external 500GB HD and created "Install Yosemite" installer.
After doubling installer, "verifying" took about 10-15 minutes before an "Install OS X" window opens warning that Installer cannot install from this disc (i.e. active external HD running 10.10.3) and to select another formatted disc (I selected the formatted but blank 2TG external HD as target but the installer would not install to that HD.

Having "Yosemite.iso" on internal 10.11.5 Mac HD and "Yosemite.dmg" on external 500GB HD, can I somehow burn Yosemite onto a blank DVD to create an alternate Startup Disc which I can insert into Superdrive prior to opening System Preferences/Startup Disc to select the burnt installer DVD.
AND, as the file to be burnt is 5.49GB and SL DVD blank is 4.7GB capacity, how is the OS X burn possible.
OR, do I need to insert a blank DL DVD blank with a listed capacity of 8.5GB?

Sincerely, PaulRanger2.

 

[DeltaMac]

OS X installers on DVD are terrible since Lion. You can get them to work, but it's way more trouble than it is worth to have your precious installer on a piece of unreliable plastic.
Much better is to use an 8GB USB flash drive. Get a new one just to make the installer. You definitely can't put the installer on any partition less than 6GB. That makes the 8GB flash drive an ideal size...
Download DiskmakerX.
Trash your present Yosemite installers (delete them from your boot drive, too), then download again from the App Store (forget the questionable-sourced .iso that you have, too)
If you download from the App Store, you will get the most current version 10.10.5.

So, you now have DiskmakerX, and you have a good download of the Yosemite installer.app
Format your new USB flash drive with your Disk Utility. Make the flash drive MacOS Extended format.
Launch DiskmakerX. Choose the Yosemite option, then choose the location for your downloaded Yosemite installer, which should be in your Applications folder.
Select the USB flash drive as the destination for the Yosemite installer. You will then be asked to provide your admin password. Let DiskMakerX complete, which may take anywhere from 10 to 30 minutes, maybe even longer - depends on the speed of the flash drive.
When that completes, you can boot to your new USB Yosemite installer drive. And, now you can install Yosemite on whatever drive you need to use for Yosemite.