A good start to walk around and scratch head. But i think it will not really help. Vue 5 can read Vue 4 stuff but not older one. So the problem is the Vue 3 things you still want to use. The best and almost only solution is to open the things in Vue 4 and save them there again. As simple as that. The converter not always does what the intention is - as we can see in a lot of threads here in the forum.

One day your ship comes in - but you're at the airport.