Hi. Are there updated instructions for setting up this extension? Considering nowadays we have to add external files through the "import local package" option (we can't right click on extension + add existing and pick a file such as .gmez anymore, only gamemaker resources files (.yy)).

That's a very neat sample pack! Perfect for testing some stuff, the tiles are well-designed and based on retro platform games from the 90s.  Also, I wanna say thank you to the creator for making it available for free.