How to go about this.
Is there a way to actually boot up, start up the old Electrum app from the hard disk and then it will itself find its wallet.
The default installation and data directory has always been the same since 2014, except if you've used the "
portable version" or set a custom datadir.
With that; if you didn't wiped the disk, the OS is intact and you're able to boot it:
you can install the latest version of Electrum and it should be able to find and open the wallet files without issues if it's still there (
but don't).
Electrum will automatically search for the last opened wallet file logged in the config file in Electrum's data directory, clicking "
next" will upgrade that wallet file but it might encounter issues during that process.
So it's best to find the wallet file first to be able to create a backup in case it happen.