SkateZilla has the full post available at the following Eagle forum link:

https://forums.eagle.ru/showthread.php?t=114030 SkateZilla’s GUIDE: Using DCS Updater to Update, Revert, Repair, or Install Modules

I required to update to openbeta in order to test a particular flight module.

Hold left Shift key and right click, see image below…left click ‘Open command window here’.

UPDATER VERSION 2.6.8.41 And Newer Use:
Type: dcs_updater.exe update @Branch (ie DCS_updater.exe update 1.5.1@openbeta, DCS_updater.exe update 2.0.0@openalpha )
DCS_updater.exe update @release
DCS_updater.exe update @openbeta
DCS_updater.exe update @openalpha

If you want to install a particular flight module try the following:

DCS_updater.exe install F-86F
DCS_updater.exe install A-10C
DCS_updater.exe install AJS37
DCS_updater.exe install