....here the log about the error:
00000.000 === Log opened UTC 2019-10-10 19:27:27
00000.013 INFO : DCS_Updater/2.9.8.81 (Windows NT 10.0.18362; Win64; de-DE)
00000.013 INFO : cmdline: "E:\dcs\Eagle Dynamics\DCS World\bin\dcs_updater.exe" --apply install F-16C
00000.017 STATUS: Initializing...
00000.019 INFO : basedir: E:\dcs\Eagle Dynamics\DCS World
00000.020 INFO : DCS/2.5.5.35461 (x86_64; DE; WORLD,FC3,NEVADA_terrain,MIG-21BIS,F-86F,UH-1H,A-10C,CA,P-51D,KA-50,F-5E,WWII-ARMOUR,SPITFIRE-MKIX,MAPLEFLAG_F5E_BFM_campaign,NORMANDY_terrain,FA-18C,PERSIANGULF_terrain,HEATBLUR_F-14,MAPLEFLAG_FA18C_AGGRESSORS_BFM_campaign,RAZBAM_AV8BNA)
00000.020 INFO : branch:
00000.020 STATUS: Connecting to update servers...
00000.283 INFO : Got reply from http://www.digitalcombatsimulator.com
00000.352 INFO : Got reply from srv8update.digitalcombatsimulator.com
00000.353 STATUS: Verifying cached version info...
00000.537 STATUS: Bereite die Installation vor ...F-16C ...
00000.682 ERROR: Unknown module F-16C
00009.324 === Log closed.