The season pass has never been bundled. Only Episode 1 or Episodes 1+2 have been bundled.
If you had the Season Pass then you would have all four episodes.
The only way to upgrade to the full season is to buy the missing episodes from the dev or buy the upgrade at another site. You can't do it at Steam.
I bought it at daily royal, steam still says I have only episodes 1 and 2 in the DLC tab, however all 4 episodes and the comic appear and are playable from the launcher that pulls up. So it's basically impossible to know whether you bought the season pass before or not unless you find the receipt. Thanks again.
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