Wait, are you trying to ask for support for pirated copies, or are you playing the demos? In the former case that's not going to happen.
If it's the demos though, you can't have all the demos in one engine install. I agree this is kinda dumb, but on the other hand it does make sense that they'd decide development time is better spent on making new stuff.
The good news is, for playing user-made holds, you don't have to switch around! The Second Sky demo is perfectly capable of importing holds made in any version.
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636th Trapdoor Replacer
Official Hold Progress:
Click here to view the secret text
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King Dugan's Dungeon 2.0 - Mastered+
Journey to Rooted Hold - Mastered+
The City Beneath - Conquered, 55%
Gunthro and the Epic Blunder - Mastered+
The Second Sky - Conquered 40%
Smitemastery 101 - Mastered
Master Locks - Mastered
Devilishy Dangerous Dungeons of Doom - Mastered
Suit Pursuit - Conquered, 37%
Finding the First Truth - Conquered, 18%