Can I delete the file "version_manifest_v2.json" that is in the version folder in % appdata% / Minecraft, because today I deleted the previous versions that I no longer used and saw this file. I thank for the attention.
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See also: https://www.reddit.com/r/Mojira/comments/kj0ytm/what_is_version_manifest_v2json/
(If you're running into that file showing up in Windows' recent files list, do create a new bug report, though in the MCL project and not in MC, as it's launcher related. Otherwise, if you were just curious about that file's purpose, this tracker isn't the right place but I think that /r/mojira thread should answer most questions.)
You can if you'd like, though it will just be downloaded again every time you open the Minecraft Launcher. This is the file that the launcher uses to determine which versions you can use 🙂
Also, this is not a bug report. I'd recommend asking a question like this somewhere else like the Minecraft Discord or on reddit in the future.