IntraWeb 15 Will not install in RadStudio 10.4 (Sydney)

[Mischa]

I am trying to install IntraWeb 15.2.2.1 into RadStudio 10.4 (Sydney), but it will not install. I have installed "update 1"
It will install into RadStudio 10.3, but gives me other problems which I will post in another thread.
In all instances I have used the remove tool, as well as ensured that all previous IntraWeb files have been removed, and even restarted my system.

[kudzu]

"but it will not install"

Is not enough info for me to even begin to assist. Please provide more information.