I found out coincidentally last night that the first launch of BatChmod 1.7b5 allows no file alteration (dropdown lists are greyed out) but launching a second copy of the app suddenly livens it up under Cat and BS. Weird but true.
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macOS 11 Big Sur on Unsupported Macs Thread
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I had read it on this page: https://lamanzanamordida.net/noticias/landamientos/beta-3-ios-14-resto-sistemas/
The information seems to be wrong, sorry.
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Apple did not released Big Sur DP3 as of this moment. It's not on Apple Developer, Releases announcement page or on the sucatalog.
Sorry, sorry, it's my impatience !!!!! 
Yep, now its available
12.88 GB.
12.88 GB.
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We need someone who post direct link to installer or uploaded it to cloud drive. As I understand now, for unsupported macs it's only one way to update.
Here is a link for beta3 (12.88 GB) : http://swcdn.apple.com/content/down...fasb0217grmmyplfd6o7mqfp/InstallAssistant.pkg
(I guess CatalinaOTAswufix also can download it from Catalina)
Thanks to @ASentientBot for his Hax.dylib and BigSur beta1 hint of apple "InstallAssistant" package name.
Just for curiosity I am going to spoof the Mac through usbopencore to check the size of that "Incremental update image" (from Beta1 and Beta 2 Install).
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Can confirm that
but it was slow. Switched to the .pkg link to get full speed.
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Is there a way to just upgrade from beta 2 to beta 3. Without having to reinstall everything?
Can confirm that
Here is MacBook7,1 through USBOpenCoreAPFSloader3b spoofed as MacBookAir6,2 , "Incremental update image" showed after clicked "More Info" (as apple suggested) size from Beta 2 is 4,96 GB .
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Help me please i made this command nvram boot-args="amfi_get_out_of_my_way=0x1" in recovery mode and now i have a empty symbol when i try to boot big sur OS, what can i do?
I think you forget "no_compat_check" or equal argument.
As I understand you need to delete systemversion.plist in CoreServices, but it's too hard for me, so i reinstall whole system from Catalina partition.
Beta 3 installed, but without Wi-Fi or AirDrop. When trying the @jackluke solution for beta 1 and 2 the mac stops at startup and restarts a few times and boots without WiFi ... Any solution?