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Sorry to bother you but,if you are a current user of G-Craft + we recommend you to switch to the G-Craft modpack.
If you want to keep your world you will need to copy them manually.
How to :
📁Open modpack folder (G-Craft + )
Find the "save" folder
Copy all your world to your clipboard (Ctrl + c) (CMD + c)
Open the G-Craft folder (after installing it)
Paste your world onto the "save" folder
Done !

OUTDATED, please use the G-Craft modpack. modrinth.com/modpack/g-craft