TR2 on Steam includes the original installer (which is entirely useless since the game is already on your hard drive)
you can get the widescreen patcher at https://tombraiders.net/stella/downloads/widescreen.html btw, it's a great tool for playing classic Tomb Raider on a modern computer
@noiob /It is strongly recommended that you exit all Windows programs before running this Setup program/
also completely useless but included: the original autorun.exe