Same, i'm looking for a solution as well.
Here's the log that i get:
00000.021 --- Log file: E:\Program Files\Eagle Dynamics\DCS World\autoupdate_log.txt
00000.000 === Log opened UTC 2019-12-24 17:33:12
00000.012 INFO : DCS_Updater/2.9.8.81 (Windows NT 10.0.17134; Win64; fr-FR)
00000.012 INFO : cmdline: "E:\Program Files\Eagle Dynamics\DCS World\bin\dcs_updater.exe" --apply install DEKA_JF-17
00000.017 STATUS: Initializing...
00000.021 INFO : basedir: E:\Program Files\Eagle Dynamics\DCS World
00000.022 INFO : DCS/2.5.5.41371 (x86_64; FR; WORLD,F-5E,RAZBAM_M-2000C,L-39,MIG-15BIS,MIG-21BIS,BF-109K4,MI-8MTV2,A-10C,FC3)
00000.022 INFO : branch:
00000.022 STATUS: Connecting to update servers...
00000.390 INFO : Got reply from http://www.digitalcombatsimulator.com
00000.908 INFO : Got reply from srv10update.digitalcombatsimulator.com
00000.925 STATUS: Verifying cached version info...
00001.621 STATUS: Préparation de l'installationDEKA_JF-17 ...
00001.756 ERROR: Unknown module DEKA_JF-17
00004.671 === Log closed.
Edit: I tried again, now my log is longer, seems like it's the same as your's.
I also used the commands to force the update because the updater wouldn't auto update.