Saves from versions 3.0 or 3.01 are generally compatible with v3.5. Important Notes Odyssey of Gianna by Vhiel - itch.io
Open the extracted folder and look for an executable file named "Odyssey of Gianna Launcher.exe" . Run: Double-click the launcher to start the game. Odyssey_of_Gianna_v3.5.rar
Use an archive manager like WinRAR or 7-Zip to extract the folder from the .rar file. Saves from versions 3