Trying to install the update today now that I've got some time to play it, but I keep getting this error. Searched around and it seems there's no official fixes. Just wanna know if anyone else is having this problem before I submit a ticket

SUPPORT CENTER -> GALAXY -> Error codes

https://support.gog.com/hc/en-us/articles/360013544357-GOG-GALAXY-Installation-failed-E9-Update-failed-E9-GOG-com-servers-returned-an-unknown-error?product=gog

And there is also a Forum page just only for this error with (maybe) more information

https://www.gog.com/forum/general_beta_gog_galaxy_2.0/installation_error_e9/page2

On the last entry in that page is a post how to resume the download for cyberpunk without loosing everything downloaded prior. maybe that helps

Its a general error. if trying again and checking connection and firewall settings doesn't fix - I would get in touch with support - good luck, u'll need it.