Hi! I have an 
Aternos Server with my girlfriend with over 50 mods. We started playing without knowing that we missed to uploud the 51th mod: Decocraft. We are trying to uploaded via TLMODS with no success. We manage to downloaded via TL files but the server cannot run it, popping up this message on the screen:
Server Mods rejections:
Decocraft: Requieres version 2.6.3.7 but mod is not found on client.
Could someone help me please? Thanks! Have a nice day! 
