It would be great if someone could put the answer on the front page. Because this question comes up every now and then. Every few posts about the differences in the version of the game.
This is the original response from one of the game's developers:
Hello all, as you may all know there are presently three versions of Claire's Quest. However, since there's been a lot of confusion over the name 'Complete Edition' (people keep assuming it is the complete state of the game in progress), we're going to rename it 'the Collector's Edition'.
---
1. The 'standard' version of Claire's Quest, ie. the Patreon Version, or the 'Black Edition', includes the Urchins Questline and shotacon content, and related sidequests - but not the Showgirls Questline in Valos.
---
2. The Steam-exclusive version, or 'Gold Edition', has no Urchins or shotacon content, but in it's place has the Showgirls Questline sponsored by our publisher to make up for it...
---
3. Finally, 'The Collector's Edition' of Claire's Quest includes all of the above content...