As long as you're sure you've got the correct seed phrase written down, and backupped the wallet files, not much could happen. (in reality, the seed phrase alone suffices, but it's never a bad idear to have a fallback).
Worst case scenario, you can restore your wallet from seed, or use the backupped wallet files...
But an upgrade like this should work out-of-the-box. If you're unsure, you can even download electrum on a clean, second pc and restore the wallet from seed without removing the original wallet from the original pc.
BTW: do verify the signature of any electrum binary you download, a lot of fake electrum download sites are popping up lately!
Thanks for your response sounds like Great advice thanks again.
