It's super easy, just download and put the "Better Maps (By Arnie)" folder in your mods folder! That's it! (make sure to unzip the folder first if you are using the unmerged version!)
<aside> đź’ˇ You can also install maps separately now, by adding the wanted .package files to your mods folder.
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The Install Directory is usually locatd under:
Make sure you have enabled Mods in your game’s settings! Go to settings/other and check the little boxes “enable custom content” and “enable script mods”