Having a lot of trouble when getting into the private server (custom map issues or what not?)
Take these Steps:
1. Launch Safari
2. Go to UnRarX
3. Download UnRarX (its basically the Mac version of WinRar)
4. Once you install the program go to 1st MRB Map Packs
5. Download the map packs (this is only a tutorial of downloading map packs 1-9 because 10 is not required, its more of a bonus)
6. Once you completed all the downloads, extract the files with UnRarX
7. Once extracted, copy the extracted files
8. Open Finder
9. Click on your computer name (should be right under desktop)
10. Click Library
11. Click Application Support
12. Click Steam
13. Click SteamApps
14. Click your account name (ex. zeldagamerz) (it should be located on the bottom)
15. Click day of defeat source
16. Click dod
17. Click maps
18. Finally paste the copied maps and you should be good to go
If you have any trouble message me and I will do my best to help you!