Epic only sells Shadow of the TR: Definitive , since they just recently added that.

And everybody a while ago on Steam got force-upgraded from Shadow of the TR (Regular) to Shadow of the TR: Definitive. Not like anything changed, as it mainly added DLC support. [shrug]

Also, after the Definitive Ed. 1st came out, a very recent update that came out just added Epic Services support to all versions (Steam and Epic).

Of course, what's nice on Epic version - it comes w/ all the DLC's straight-up; it's Definitive from the get-go over there, since it went very late there (i.e. recently).

On Steam - you would need to buy the Definitive Edition Package that comes WITH THE DLC's (and that is ALL that is there now, Standard version's no longer sold). Standard was often the package many got from Humble months ago when it was in a Humble Choice (Monthly). The Standard Definitive doesn't come w/ the DLC's, so you'd have to do the Definitive Bundle Upgrade afterwards also, if you got the Standard Definitive version there.

This is also showing up for me now - thanks for the updates