[0.15.9] Map Version Conflict on New Game and Multiplayer

[toewe]

I play Factorio on Steam and was using the updating latest version 0.15.x (0.15.13 at this point) in the BETAS rider of the game properties since 0.15 came out without any problems. A few days ago I wanted to join a multiplayer game of two friends who also play the game on Steam. One of them hosts the game and both play on a fix beta version (0.15.2 - Factorio Experimental 0.15.9) without any mods ever since they started with 0.15, in particular with that map.

I downgraded through the BETAS rider to exactly that version. After joining the game through the "Join Game" button in the friends window on the steam overlay I could connect and download the map. But right after downloading the message "Cannot load downloaded map: map version 0.15.12 - 0 is higher than the game version" appeared and I got back to the main menu. My friends both told me, they saw the message that I was entering the game and downloading the map. As I got the error message they got the message that I dropped out of the game.

I expected to join the multiplayer game.

I then tried to
- generate a new single player map
- start any campaign
- load older saved maps (i.e. 0.14.20/21/22 and 0.15.3/5/6)
and got a similiar error message. "Map version 0.15.12-0 cannot be loaded because it's higher than the game version"

I expected to start a new singleplayer game.

I tried both things (singleplayer and multiplayer) in "0.15.2 - Factorio Experimental 0.15.9" and "0.15.9 - Factorio Experimental 0.15.9" and got the same errors.

As far as I understand it: the game creates a map with a higher version than itself and ends up in that error message.

The singleplayer maps (generate, campaign and loading savegame) worked in "0.15.10 - Factorio Experimental 0.15.10" and "0.15.x - Latest Factorio Experimental" but understandably not multiplayer in this situation due to game version mismatch.

[Rseding91]

Try deleting blueprint-storage.dat in your %Appdata%\Factorio folder and see if it allows you to downgrade.

[toewe]

That helped for the singleplayer maps. I will report, if it helps on the multiplayer too. But I think it will.

Thanks a lot.