I am currently using Bitcoin Core version v0.18.0 (64-bit) on Windows. Noticed there is a Bitcoin Core 22.0 available now. Couple questions:

1) How did Core go from a .18 version all the way to 22 versions?
2) Can I upgrade my current .18 to 22 and still keep my current chain or do I have to download the whole thing all over again?

Thanks!