Step 1:

Open your Profile and in the 'My mods' tab locate BepInExPack

Step 2:

Select BepInExPack and click 'Uninstall'

Step 3:

In the popup select 'Uninstall all (recommended)', this will remove most/all your current mods

Step 4:

If you have any additional mods left, remove them as well.

Step 5:

Select the 'Get mods' tab and search for 'TeamStream ModPack'

Step 6:

Select the mod and click 'Download'

Step 7:

In the popup select 'Download with dependencies'

Step 8:

Enjoy!