Cannot Update/upgrade to Sierra from El Capitan

[trixman]

I have a Mac Pro 5,1 machine. It came to me originally with Yosemite installed and I upgraded it a year or so ago to El Capitan. It currently has version 10.11.6 installed.

I have hardly used the machine in quite a while but am resurrecting it for front-line service in non-linear video editing world.

I want to update the OS to Sierra 10.12, but can only find a 10.12.1 download which will not install as it needs 10.12 installed first.

Can anyone recommend a solution?

Thanks.

 

[CoastalOR]

Here is a link to a Apple web page that has instructions and links to download older Mac OS:

How to download and install macOS - Apple Support

Download and install current or previous versions of the Mac operating system on compatible Mac computers.

support.apple.com

 

[trixman]

Here is a link to a Apple web page that has instructions and links to download older Mac OS:

How to download and install macOS - Apple Support

Download and install current or previous versions of the Mac operating system on compatible Mac computers.

support.apple.com

Thanks but I tried that several times today and the 10.12 link says:

Access Denied​

You don't have permission to access "http://updates-http.cdn-apple.com/2...5f4-0015-4c41-9f44-39d3d2aca067/InstallOS.dmg" on this server.
Reference #18.2bb1c117.1664743076.31e92d4

 

[CoastalOR]

It looks like a bad link on the Apple page. I would suggest contacting Apple Support to make them aware of the problem so it can be fixed.

EDIT: The link appears to not be secure (it is http not https).

EDIT2: http does not seem to be the problem because both Yosemite & El Capitan use http and they work fine. The Sierra download link seems to have a problem with the certificate when I have it display "Show Details".