do i need anything specific compared to the old electrum wallet? do i reinstall the new version directly? does the old one get overwritten? do i need to save anything?
You can Uninstall the old one. If it is a stand alone version just delete the file.
So is it important in the future to continue to update ledger and electrum?
is there anything that can go wrong with the procedure? (yes I left everything there so as not to do something stupid)
New versions are always safer to use, because they fiz vulnerabilities and bugs.
Just have the seed with you, because you may lose your coins if you reset the device and the seed is missing