I recently saw DanTDM's video about Minecraft 2.0 (version from 2013's 1st april jokes) so I wanted to try it on my own. I remember installing custom/older versions on old launcher (the one before 1.11) so I thought that it should be easy. But I have problem, on this new launcher, when I transported the jar file to .miencraft/versions, launcher won't recognize it. Help please?
Did you put the folder containing the .jar in the versions folder? It should appear on the list of versions when you're editing a profile.
You should be able to select the version you want to download from that that menu. I don't know why people think you download the jar from a separate source. I would suggest you scan your pc.
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You must also delete some lines from the json file, as shown in the attachment in the link or the launcher will just redownload the jar according to the version specified in the download URL, regardless of the actual name (this also applies to any mods, though most of them have installers that do this for you).
Also, Mojang has updated various libraries over time and not just any version's json may work; for example, 1.6.4 uses LWJGL 2.9.0 while 1.11.2 uses 2.9.4. The closest match to 2.0 would be 1.5.1, which was released about a week earlier: