Well, after querying this with Rip, and trying the latest builds of Animation Lab, it appears that we can either run AniLab - under XP - up to TC v19, or, using later versions of TC, under Win 8.xx.
I installed an earlier version of AniLab v5 on my XP machine and it runs with TC v16 to v19.
I did not try v20 but, using this earlier build crashes v21.
Later builds of Anilab only appear to run under Win 8.xx - 32-bit or 64-bit.
Either way, I can still use my XP PC for a few more years, or, until it keels over and dies!