One day, I asked my friend to play modded multiplayer Minecraft with the Ars Magica 2 mod for Forge 1.7.10, but when I clicked on the "Ars Magica 2" box in Aternos mods, there was nothing else but a message saying "No compatible versions found".
Website of the mod (in Aternos): https://aternos.org/addons/a/curseforge/ars-magica-2
Website of the mod (in Curseforge): https://www.curseforge.com/minecraft/mc-mods/ars-magica-2
An assistance would be appreciated, and thank you for understanding.