Cornico,
just installed MSP 13 build 943 on Windows 7 and the VASST Fasst Apps extensions are there.
Are you using the English version? JohnnyRoy of VASST states in this thread that the apps are
"compatible with the English version of Movie Studio 13, Movie Studio Platinum 12 & 13,."
Cornico,
this seems odd. I have Win 7 64-bit and my Fasst Apps show up in 64-bit MSP 12 & 13 (latest builds) as well as in VPro 12 & 13.
They did appear for many users in MSP 13 build 879 judging by several forum posts.
The release notes seem to confirm that the builds after 879 do not offer much, maybe only some language updates.