Create or log in to your Aternos account
Open your server dashboard
Go to Software
Select Forge
Choose the Minecraft version required by RLCraft
Install Forge
Go to Mods
Search for RLCraft-related modpack support or install the required mods manually
If available, use the Modpacks section and select RLCraft
Install the modpack
Start the server
Open your Minecraft launcher
Install the same Minecraft version and Forge profile
Launch Minecraft with the matching Forge version
Join your Aternos server using the server address
If the server does not start, verify that all required mods and versions match exactly