So I ran 1.5 fine last night, everything worked nicely. I installed my A-10 and FC3 modules through the ingame module manager and tested both and they worked.
I went to install the KA-50 module and it failed due to I think not having enough space on the C: drive. My DCS install is on my F: drive.
I couldn't get DCS to start after that, it gets stuck at 10% on the loading screen forever. I uninstalled and reinstalled 3 times in different places. I manually installed the modules through the command prompt on the latest installation and still have the same issue. Please help.
RESOLVED: delete C:\Users\yourname\Saved Games\DCS.openbeta folder, DCS will make a new one and that fixed my issue.