Sadly you cant download another forge version. Aternos should say what mods are incompatible with the forge version, delete those mods or download older versions of them.
Posts by CuteNikoo
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I created a server with 65 mods. It was running with no lag for hours untill i decided to add a mod. It now crashes without any error message and i cant figure out why.
Removing the mod didnt help.
Saving the world, loading in a backup of the server that was saved before adding the mod, then uploading the world back didnt help.
I think it may have to do with the world file.
Log: https://mclo.gs/ZrJVZr7