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I have two versions of Photoshop and don't know why: version 20.0.8 and 21.1.2. Can I uninstall version 20.0.8 without any problem?
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Sure. If the new version works perfectly for you and you're certain you will never ever need the old version again, go ahead and uninstall it.
However, if you're not 100% sure about the new version and you have plenty of hard disk space, keep it. It doesn't hurt anything to have multiple versions of Photoshop.