I'm getting this error message when I try to download/install from mod manager:
=== Log opened UTC 2016-01-16 00:31:38
INFO : DCS_Updater/2.6.11.47 (Windows NT 6.2.9200; Win64; en-GB)
INFO : cmdline: "G:\DCS World 2 OpenAlpha\bin\DCS_updater.exe" --apply install F15C-REDFLAG_campaign
STATUS: Initializing...
INFO : basedir: G:\DCS World 2 OpenAlpha
INFO : sourcetag: nevada
INFO : dcs_variant.txt: openalpha
INFO : DCS/2.0.0.48763.61 (x86_64; EN; WORLD,L-39,MIG-15BIS,VEAO_HAWK,MIG-21BIS,BF-109K4,F-86F,FW-190D9,MI-8MTV2,UH-1H,A-10C,FC3,CA,P-51D,KA-50,NEVADA_terrain,RAZBAM_M-2000C)
INFO : branch: openalpha
STATUS: Connecting to update servers...
INFO : Got reply from http://www.digitalcombatsimulator.com
INFO : Got reply from srv1.update.digitalcombatsimulator.com
STATUS: Verifying cached version info...
STATUS: Preparing to install F15C-REDFLAG_campaign ...
ERROR: Unknown module F15C-REDFLAG_campaign
=== Log closed.