I see two scenario's:
1:
Uninstall SABnzbd from your MAC, including the config file sabnzbd.ini
Install and start SABnzbd. It should give you the wizard. If no wizard, stop SABnzbd and find & delete sabnzbd.ini, and start SABnzbd again: you should get the wizard
In the SAB wizard, only fill out your newsserver(s). Do NOT change directories.
Check that the 1GB testfile works OK. Then do your downloads.
2:
Use that "different newsgroup downloader"
Unusable RAR error
Forum rules
Help us help you:
Help us help you:
- Are you using the latest stable version of SABnzbd? Downloads page.
- Tell us what system you run SABnzbd on.
- Adhere to the forum rules.
- Do you experience problems during downloading?
Check your connection in Status and Interface settings window.
Use Test Server in Config > Servers.
We will probably ask you to do a test using only basic settings. - Do you experience problems during repair or unpacking?
Enable +Debug logging in the Status and Interface settings window and share the relevant parts of the log here using [ code ] sections.