Can't sign in Photoshop

Don't start by downloading Photoshop.

Start by downloading the Creative Cloud desktop app. Open it, and sign in with your user name and password. From there, install Photoshop (and any other applications).

The CC desktop app is where you manage all your applications. All installs, uninstalls and updates are done in the CC desktop app.

Look through the preferences in the CC app. You may want to turn off automatic app updates, for instance.

EDIT cross post

@LaPapera did you install the Creative Cloud app and sign in with your Adobe account

https://creativecloud.adobe.com/apps/download/creative-cloud?locale=en