Zoom cloud meetings 3.5.53922.620 will install without problems or necessary registry fakes on w2k exkernel.
Download link (I had to spend some time until I found it out):
https://zoom.us/client/3.5.53922.0620/ZoomInstaller.exe
It will install in documents and settings\*user*\Appdata\Zoom\bin.
Then we need to hexedit cmmlib.dll, XmppDll.dll, zVideoApp.dll, search for 3.5.53922.0620 and change these entries to the final version, now 4.6.19253.0401. Then the autoupdate function cannot replace the files with the newer ones which wont work. It should also be possible to install