@ubi-raziel - Could we get an update on this please? Is there any progress / timescales? Some more communication on this matter would be appreciated, given the numbers of people unable to upgrade to the PS5 version.
Finally - It's working for me here in the UK from a PS4 disk. I can download the Free PS5 Upgrade, 13 days after the console launch. A pity this issue had occurred but pleased that Ubisoft/Sony eventually addressed it.