Hi !
I also create a game with Solarus. From the beginning, I worked on the version 1.4.5 and I want to pass on the latest. I downloaded the version 1.5.2 and, when I want to upgrade, I got this message box (In attachment).
Someone knows how to fix it ?
It is a known bug of 1.5.2.
You can use this beta version of 1.5.3 (the final version 1.5.3 will be released soon): http://www.solarus-games.org/downloads/solarus/win32/solarus-1.5.3-snapshot-20170301-win32.zip
"All updates were successful!"
Thank you ! ;)