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