The following steps need to be completed only once, even when playing multiple Archipelago games.
A single install can handle playing in multiple different Archipelago games at the same time.
- Extract the Archipelago Mod for Hololive Treasure Mountain into your Hololive Treasure Mountain install, such that the folder
BepInEx is in the same folder as the game executable TreasureMountain.exe. - Launch the game through Steam. The first time you do this, it may take a while (several minutes) to load, or even crash. Simply retry if it does.
Open the “Options” menu and click on the Archipelago icon in the lower right corner.
This will open a popup window, where you can enter the details of your Archipelago room.
On Linux, this can sometimes take a while.
Connecting to the same game via the connection popup, even if it's at a different address, will load the correct save file.