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I don't believe this v1.18.2 supports version upgrade. And I advise against it due to changes on World Generation by Mojang's side and on mod's side.
Performance wise, I believe a 12+GB System RAM with 6GB allocated should be perfect to play. 5GB RAM allocated might be a stretch though.
Most Important Change(That I'm aware of):
-Consistency Plus was removed
-The Graveyard
-Flight Rings
-Enhanced Celestials
-?
(You can install them back though, I just removed it because I was near the max of my allocated RAM)
Also, due to my bad mods tracking(apologies), some mods has changed their config file to default on the mod upgrade. I'll publish another modpack with the config fix that I've found + whatever you report/suggest
This mod has no additional files