i put it on my desktop which forces me to clean it

If it's just a game I'm buying to "support" the author (long stare right into the camera), I don't do anything with it.

If I'm thinking of a campaign, I put the campaign idea in a folder and put the folder by my desk. Every so often I come across a new roleplayer or I learn something new about someone I already game with, then I take the folder out and see what I think I can put a group together for.

Step 1: buy and download the thing.

Step 2: shove it somewhere in my misc. ttrpg systems folder, with subfolders organised by system (for the ones I've played/have solid, scheduled plans TO play soon) or somewhere in the general Rule-systems subfolder: 

Step 3: if it's a short game, read it immediately. If it's a longer game, read the intro and skim large parts of the rest to get a feel for the system.

Step 4: yell about it to friends so that they get excited too, and get roped into playing it with you.

Step 5: practise dark magics to bend timezones and schedules to your will, so that you actually get to play it.

Step 6: get intensely enthusiastic about it and draw your character/related art, before and/or after the game is played. more yelling excitedly about it is optional, but encouraged.

Step 7: give feedback if people want it, but be incredibly likely to forget about this.

repeat as necessary.

On a serious note: steps 1 and 3 are probably the most important here: download the game, and look at it. If it's small enough to read in just a few minutes, take the time to do so right then and there. If it requires a bigger time-investment, read the intro, and skim as much of the rest as you can, just so you can get a feel for it. It's much easier to motivate yourself to find the time for a proper read if you've actually taken the time to look at it first, instead of leaving it sitting around unopened and unread.

I usually read through a game enough to get a feel for the game. (Sometimes that's the entire game, sometimes it's just a few sections to get an understanding what it's like.)

Then, if I feel the game is compelling or interesting, I put it in my "Games we might play sometime" Google doc, with a paragraph or two about what I find interesting about the game and a link to where it can be found. Sometimes, when discussing potential games with my friends, I'll share the document to them. But mostly, it's for me to keep track of games I haven't tried yet that I would like to do.

I have a regular group that I usually play one-shots or short campaigns with on the weekends. If I find something that interests me I'll usually post it in our discord to see if anyone else wants to give it try. Sometimes we even play it!