Visit the TPM Tactical YouTube for my latest videos!
Troubleshooting steps which may help you with mods not downloading on PC.
Uninstall/delete mods from within the game (mod manager) and try again.
Delete the mods causing issues from C:\Users\<UserName>\Documents\My Games\ArmaReforger\addons or C:\Users<Username>\OneDrive\Documents\My Games\ArmaReforger\addons (I would highly recommend not having the AR directory within OneDrive) and try again.
Check windows defender to see if is is blocking AR (Protection History), if so add exception. Maybe just add exception anyway.
Temp disable or add exception to other AV software (if installed).
Change DNS to Google's DNS as a test and see if you can download.
Disable OneDrive or ensure AR folder structure is not being backed up.
Set AR download and mod directory to a different location in startup parameters (ArmaReforgerSteam.exe -addonDownloadDir D:\DownloadedMods)
Reinstall AR
I haven't updated my PC Mods issue video to 1.4 yet, however here is the link which might help you further.
If you are being kicked from the queue and receiving a "Connection Failed" error, this might be a DNS issue. A solution which has helped a few people is to change their router DNS to 1.1.1.1 (Cloudflare).