I think you'll have to open your project in AC7 and save it as an archive (.pla). This will preserve your library parts. AC7 will open back to 4.5 or something.
Then you'll have to install AC9 and open your AC7 file, and re-save it as an AC9.pla.
AC11 will open back to AC9.
NB:
If you're on the Mac, there is an AC7 version for OSX which will run on the latest Macintels. The AC11-updated Wibu key will work.
However, the
installers
for AC7 and AC9 will not run on the Macintels. You will want to copy a full, working installation from a PPC Mac.
Your reseller should be able to supply you with old versions when needed.
As for Window/Door builder, I don't know. Contact Cadimage.
AC4.1-AC26SWE; MacOS13.5.1; MP5,1+MBP16,1