i have an old tp5. i can install it on w7 and w10 on the C drive
can i do the same in w11???
Well, if it works with Windows 10, chances are that it will with Windows 11 too.
However, you should be sure NOT to install it in Program Files or another system directory that is write-protected by the 'UAC / User Access Control' feature in modern Windows versions. I still continue to use some very old programs myself, and I've created a folder 'C:\LegacySW' to install them in.