You MUST use the client to access your games. I've seen many Linux (I have Ubuntu 22.04) reviewers state lack of client viability, and my own experience will verify that. Granted, there are so many configurations for computers, it is difficult to know all possibilities of issues. After 3 days of no access to the game I bought through my browser, I asked for and received a refund, and REQUESTED termination of my account. I will NEVER go to steampowered.com while I DON't need a client on GOG.com to download a game into my computer.