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Net link 1:
This explains how to install mods manually.
How to install Mods/Custom Maps on Non-Steam BO3 (check description if you dont own steam bo3)
https://www.youtube.com/watch?v=9QSigMLjgms
Net link 2:
This explains how to install maps & mods manually.
[TUTORIAL] Install BO3 Custom Maps / Mods without Using Steam Workshop Subscribe - Black Ops 3 Mods
https://www.youtube.com/watch?v=ptU29D7MXhE
PS:
I don't recommend and don't condone doing this for piracy, but to only fix the map and mod loading problems in this Bops 3 game.
Here are some net links that might give you & other people the idea on how to fix this problem with your game in your Mac & for other OSs.
https://www.reddit.com/r/blackops3/comments/su8ibk/tutorial_how_to_install_custom_maps_if_you_dont/
https://www.youtube.com/results?search_query=How+to+Install+Custom+Maps+if+you+dont+have+it+on+Steam
[TUTORIAL] Install BO3 Custom Maps / Mods without Using Steam Workshop Subscribe - Black Ops 3 Mods
https://www.youtube.com/watch?v=ptU29D7MXhE
How to install Mods/Custom Maps on Non-Steam BO3 (check description if you dont own steam bo3)
https://www.youtube.com/watch?v=9QSigMLjgms
Also try to install other mods from the Steam Workshop as a test or just to get you in multiplayer offline mode or find my downloaded mod that is in a folder somewhere in Ur Mac & put it in a zone folder like those net links I gave.
I hope this helps you & everybody else that have this problem with this game & good luck.
The thing here is that my mod should have been installed properly in one of your folders in your main game folder because I did not removed it from steam and so it should work in your Bops 3 game.
The other thing is that my Bops 3 game is in my Windows 10 Pro and it might be the reason why some maps and mods might not work properly in a different OS like your Mac, but then again I could be wrong and so google it to find a way to make it work properly in your Mac.
I hope this helps you out and good luck with that because I want this work for you.
I hope you fixed your error and if you need any more help with this, then please send me a comment in this site or google it online.
I hope this helps you and good luck with this.
All I know is that it works in my Windows 10 Pro Gaming PC and in my Steam Deck that has Windows 10 Pro for an OS, though I don't know if it works on other machines like the Xbox or the PS consoles.