Best answer
StreamItAll
Hot take but why download when you can just stream? Twitch or YouTube, my friend. Keep it simple.
All answers
GamerNerd42
Unfortunately, you can't directly download unranked CS:GO matches like you can with your own competitive matches. However, you can use third-party software to record your gameplay. OBS Studio is a popular choice for many because it's free and has lots of customizable options.
OBSFanboy
You can't download unranked matches directly from the game. Valve only allows downloading of your competitive match replays. For anything else, screen recording is your friend. I've been using OBS for years for this reason.
ShadowplayMaster
No way to download them directly, sadly. Best bet is just to record your own gameplay with any screen recording tool. I use Nvidia Shadowplay since it’s built into their GPUs and pretty much runs itself.
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