Sometimes the versions in OvO can be confusing because of how many there are, even for me. I'll try to make it easier for you.

For category extensions, there are 8 different selections you can make when submitting a run. 1.0, 1.1, 1.2/1.3/1.4, 1.4.1, 1.4.2, 1.4.3, 1.4.4, Version Implied. An easy way to figure out your version is to go to the main menu (first screen you see upon loading), and look at the bottom of your screen. There should be 2-3 digits separated by periods. Versions 1.0 and 1.1 don't have this, so 1.0 will be https://www.devovo.surge.sh , and 1.1 is https://www.dedragames.com/games/ovo/1.1

The last one is version implied. This isn't a real version, but applies to any run submitted to a category that is version specific. For instance, if you were going to submit a run for OvO 2 Alpha, that is already its own version. None of the other ones apply. Same goes for Escalade, Dev Version, and others. Hope this cleared things up for you, happy speedrunning!