Thanks for the quick reply and clear instructions.
I wonder would you know how to use steamcmd to download the beta branch?
This community guide for Insurgency has a '-beta' flag in the steamcmd 'app_upgrade' line, e.g. 'app_update 222880 -beta beta validate'. My guess here is 'beta' is the name of the beta branch intended for download.
So for CS:GO I imagine you'd use something like 'app_update 730 -beta 1.38.7.9 validate'. I have tried this and something is downloading, but since I took a blind guess at the beta branch name I suspect I'm just downloading the regular CS2 client. I hope this make sense.
Do you have any suggestions? I could try the full name of the beta branch from the dropdown menu in the Steam 'Beta Participation' menu, but as I'm not overly familiar with using command line I ask how would I write that?
Would it be: 'app_update 730 -beta "csgo_demo_viewer - 1.38.7.9" validate'?
EDIT: After a bit of digging it looks like I should use 'app_update 730 -beta csgo_demo_viewer validate'. I will report back if this works.