[1.0.0] (build 54889) Can't load save. Level.dat not found

[Nomad_59]

I play Factorio on steam and when i went to play i saw their was a update and steam as per usual has auto-updated the game. I loaded up my save and played for a while with no issues. Then i had a online class to attend, so i save and quit the game, while i was on that online class steam auto-updated the game again. when i was done with my class i come back to play the game it boots and i click continue on the main menu. and i get a "level.dat not found" error. confused i go to the single player load page and I'm greeted with a notice (picture below) that says the level.dat file inside my save file is not found. Not sure how to go about this as i never had a issue with saves getting corrupted or what not, so a little help would be nice.

I tried getting the save file back from the steam cloud save but that didn't work. that save also had the issue.
i also tried the auto saves but they also had the issues, i moved them so they are not listed in the saves.

[Rseding91]

The save format in 1.1 has changed and 1.0 wouldn't be able to load it even if it didn't (since old game versions can't load new game version saves). If you opt into the 1.1.x steam beta you can continue the save. Or load an older save.

[Nomad_59]

The save format in 1.1 has changed and 1.0 wouldn't be able to load it even if it didn't (since old game versions can't load new game version saves). If you opt into the 1.1.x steam beta you can continue the save. Or load an older save.

Well you where right even though i don't remember using the beta branch. Thanks man