1.16.3 does not exist

I opened Minecraft only the other day and it was fine, though earlier today when I tried to look for version 1.16.3, it doesn't come up at all. I've been uninstalling and reinstalling minecraft, deleting optifine because I thought that was the source of my problems (it wasn't), and now I am just upset. I have no file of version 1.1.6.3 on my Minecraft, and I've reinstalled about 3 times. Is there a way to get 1.16.3 back on my files? I've asked a friend if they could send me their file so I can see if that works.