@deroko:
The TASM version in this package is 5.3, which also exists for a very long time (it's from 2000 and shipped with "Inprise" C++ Builder 6). There are also some other updated tools for you in this package if you're still using the original TASM 5.0.

But the version 5.3 doesn't contain anything new as far as I can tell (MMX was supported already in 5.0, XMM is still unsupported). So we should assume TASM as dead.