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Long story short - I had to uninstall Unity and Unity Hub and reinstall them again. I ended up installing Unity version 2020.2.1f1. Some of my game projects were made using version 2020.1.6f1 Now I cannot open them - there is a yellow warning triangle next to those games in Unity Hub.

I am installing version 2020.1.17f1 as I type these.

So my questions:

  1. Is there no backwards compatibility between newer versions of Unity and older games?
  2. How do people deal with this? I've heard people transition their games during development into newer versions of Unity but I wasn't even able to open the games made with older version.
  3. How would I go around this if I had spent 2 years or more of development time and was suddenly locked out from my game project - how do I prevent situations like these?

Here are my Unity versions installed: enter image description here

And here are my games (tutorials mostly):

enter image description here

I may have answered my own question, but still need your input guys. I just noticed that there is a 'Select Version' dropdown on the right that allows me to open a game project in Unity version I have installed on my system. Is this how you deal with those issues?

enter image description here

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    \$\begingroup\$ Are you really locked out or is it more of a warning that the used version does not exist and you need to pick a version (as it is written at the right "Select a version"). Usually picking a higher version and opening the project will tell you to make a backup and it will try to convert it to the newer version, in most cases it fully works but if not, you were told to do a backup before. A minor version upgrade is doing less problems compared to a major one. \$\endgroup\$
    – Zibelas
    Dec 28 '20 at 10:10
  • \$\begingroup\$ It's a warning. I may have overreacted a little. \$\endgroup\$
    – codeepic
    Dec 28 '20 at 10:14

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