Just extract the new version and move the new files to where the old version is installed or move your saves from the old version to the new version. Either will work.
Viewing post in Once a Porn a Time 2 // [v0.11.1] comments
I'm afraid I'm not just a random anon on Discord and I don't feel like giving a random anon my real name, but I can try to give you a better explanation.
Download and extract the new version. Open the new folder in one window (should be something like "OnceAPornATime_0.27P2.3-pc")(I'll call this TopLevelNew) and the old folder in another one (IDK which version you have but the name should be similar to the one above just different numbers)(I'll call this TopLevelOld). Now just drag and drop all the files and folders from TopLevelNew into TopLevelOld, select to overwrite all and done, now you can delete TopLevelNew. Alternatively, you can move your saves, they are located in TopLevelOld/game/saves, just move the saves folder into TopLevelNew/game and done, now you can delete TopLevelOld.
Hopefully now it's easier to understand. If you don't understand something, just ask and I'll try my best to clarify.