Wappler 4 install clarification

Congrats on the release guys.

Can you clarify/confirm this please?

"If you have last Wappler 3 installed, make sure it was the last stable 3.9.9 and it was ran at least once.
Also make sure you have saved all files there."

Does this mean I must open EVERY project I have (even those I have not touched in months) with 3.9.9 before installing Wappler 4?