Usually as has been stated elsewhere, slims show up ~1 week or so after a release, but I it's been a month since the latest Speccy came out; so I'm unsure of the direct answer. You can always download the portable and extract it on top of your speccy install, just delete portable.dat from the folder.
SIDE NOTE: Speccy is (depending how you look at it) either almost two years old or a little older than two. Congrats Speccy
v1.01.132 (23 Apr 2010)
- First full non-beta release.
- Multi-language support added- note only English in this installer.