itch.io

Load your save online, then go saving again, you would have an option to Download it, you can also press the download button of a save in the save (not load) screen, the file should start to DL immediately. Then place your save (a json file) in the folder AppData\LocalLow\Studio Echydna\Isekai Parlor Simulator. At this point the save should be loadable in the exe version.