The question has an inconsistency in it, because you said you upgraded to macOS 11 Big Sur, but the first screen shot you posted shows macOS 10.13 High Sierra.
If you’re asking about the two screen shots instead, the reason you can’t install is that that Mac is running macOS 10.13 High Sierra, not macOS 11 Big Sur.
Adobe has been supporting the last three versions of macOS for a while. For the 2020 applications, they supported macOS 10.13, 10.14, and 10.15. Now, for the 2021 applications, as usual they have shifted up their macOS support by one version to account for the new macOS 11 Big Sur. That caused the oldest supported macOS, 10.13 High Sierra, to drop off the supported list; now a Mac must run at least macOS 10.14 to be able to install the 2021 Creative Cloud applications. If the two screen shots you posted are from the same Mac, that is why none of the new versions are compatible.
On a Mac that is truly running macOS 11 Big Sur, those applications should install.