I've just reinstalled windows 10, did the updates and the drivers. Every time I try installing Cyberpunk 2077 I get this error after a couple of seconds of downloading. Then I hit retry and 5 seconds later same thing. I wanna rip my heart out, I just reinstalled windows for this and its still not working. Please help my before I break something.....

I don't know what led you to believe reinstalling Windows might help. E9 is an unknown server error. You'll have to open a support ticket, if you haven't already done so:
GOG GALAXY Installation failed (E9)/Update failed (E9) - GOG.com servers returned an unknown error - GOG Support

If you're having trouble with the chatbot, see staff directions to open a support ticket and if that doesn't help either, try directly e-mailing support (at) gog (dot) com
Open File Explorer, enter %AllUsersProfile%\GOG.com\Galaxy\ into the address bar, then zip up the logs folder and attach it to your support ticket.

Things you can try while waiting for support to respond:
1. Open File Explorer.
2. Enter %AllUsersProfile%\GOG.com\Galaxy into the address bar.
3. While GOG Galaxy isn't running, move the storage folder somewhere like the desktop. If this doesn't help, you can delete the newly created one and put the old one back.

Try disabling IPv6 and setting your DNS to Cloudflare ("Setup on PC" section near the bottom of the page). You'll need to restart GOG Galaxy if it's currently running.

If the problem persists, you can use a web browser and download the offline installers from your library. You can afterwards click the cogwheel in the top left GOG Galaxy, then choose Add Games & Friends - Scan Folders for GOG Games. That way you can get the Galaxy-exclusive content and stuff like achievements and cloud saves.

Just listen to the final part of what IceMage says. Disabling IPv6 and outsourcing your DNS aren't exactly a smart idea.
Use the offline installers and chuck Galaxy in the bin so the usage metrics fall off.