Has this issue been resolved? if not is the project example in your vault or just sitting loose on your computer?
If in vault the epic launcher will not allow you to create project, but if you navigate directly to C:/Program Files (x86)/Epic Games/Launcher/VaultCache/ (assuming you haven’t moved it to a better location) look under the project name…then for safety copy the data folder and place somewhere else, rename etc. inside the data folder is the exe to either open project or launch game, it will allow you to open with 4.25, things may break, but you might be lucky, I just opened a 4.11 project in 4.25 … with no real issues. Good luck.