Same here, first the game complaint that I need to buy the template pack for opening a previously saved world that was created with Mario Mash-up. I looked at the settings didn't see the Mario Mash-up package then activated Natural textures package (downloaded to the local) Then in the edit section of the world I created before the Mario Mash-Up pack becomes listed with an Activate button (it was not listed before when problem first started). Clicked "Activate" and it loaded the package.
After this, the world properly opened with Mario Mash-up assets.
Berke Sokhan
Same here, first the game complaint that I need to buy the template pack for opening a previously saved world that was created with Mario Mash-up. I looked at the settings didn't see the Mario Mash-up package then activated Natural textures package (downloaded to the local) Then in the edit section of the world I created before the Mario Mash-Up pack becomes listed with an Activate button (it was not listed before when problem first started). Clicked "Activate" and it loaded the package.
After this, the world properly opened with Mario Mash-up assets.