I'm having the same issue...
00000.117 --- Log file: C:\Users\JARHEA~1\AppData\Local\Temp\DCS.openbeta\autoupdate_templog.txt
00000.000 === Log opened UTC 2020-02-16 00:14:52
00000.021 INFO : DCS_Updater/2.9.13.13 (Windows NT 10.0.18362; Win64; en-US)
00000.021 INFO : cmdline: "E:\Program Files\Eagle Dynamics\DCS World OpenBeta\bin\DCS_updater.exe"
00000.106 STATUS: Initializing...
00000.108 INFO : basedir: E:\Program Files\Eagle Dynamics\DCS World OpenBeta
00000.108 INFO : dcs_variant.txt: openbeta
00000.117 INFO : DCS/2.5.6.43503 (x86_64; EN; WORLD,F-5E,A-10C,FC3,CA,P-51D,NEVADA_terrain,FA-18C,PERSIANGULF_terrain,WWII-ARMOUR,NORMANDY_terrain,SU-33)
00000.118 INFO : branch: openbeta
00000.120 STATUS: Checking for updates...
00000.972 INFO : Got reply from http://www.digitalcombatsimulator.com
00002.042 INFO : Got reply from srv16update.digitalcombatsimulator.com
00002.044 INFO : DCS/2.5.6.43503 (x86_64; EN; WORLD,F-5E,A-10C,FC3,CA,P-51D,NEVADA_terrain,FA-18C,PERSIANGULF_terrain,WWII-ARMOUR,NORMANDY_terrain,SU-33)
00002.044 INFO : branch: openbeta
00002.045 ERROR: Can't run E:\Program Files\Eagle Dynamics\DCS World OpenBeta\bin/DCS.exe: (2) The system cannot find the file specified.
00631.139 === Log closed.
with this system error window...
I've done two DCS repairs to no change and two different restarts.
Dan