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Every time you open TMM to activate the mods, you need to re-check all the mods, before you enter the game, and if you want to change a version of a mod change it after re-check all the mods.

Scenario 1:

You want to play Tera with the mod active

1. Open Tera launcher.
2. Wait to for it to show the play button.
3. Open TMM.
4. Re-check all the mods.
5. Then play.

Scenario 2:

You want to play Tera with the mod active but you want to change some version of the mod before entering the game

1. Open Tera launcher.
2. Wait to for it to show the play button.
3. Open TMM.
4. Re-check all the mods.
5. Change the version of the mods you want to change.
6. Then play.

Scenario 3:

Changing mods version after already entered the game, while the mod is already active.

1. Close the game client.
2. Change the version of the mods you want to change.
3. Then enter the game again.

TMM is an old tool, and the dev is inactive, the only solution I can give is work around on how to use it.