Hi , I have a quick question here .
How to upgrade from a version to another new version (of Electrum) ? I simply install the other or I should unistall the old one , also does the seed works on different wallets , I mean a seed of 2.3 version should work fine on the 2.4 version ?
Yes, it works! Backup your Electrum wallet file(s) and install latest version.
Should I uninstall the old wallet before installing a new version?
It's not necessary, but it doesn't hurt either.
(I will do multiple local and remote backups of my wallet before doing any installs or upgrades.)
That's always a good idea, but it also shouldn't be necessary. The only thing to be aware of is that Electrum 2.x will upgrade your wallet format. In order to downgrade to a 1.x version (not that you ever should need to), you'll either need to restore your wallet from it's seed or use a backup from before you upgrade.
Side note: if you do remote backups, be sure you've got a strong password on the wallet, or use a zero-knowledge backup provider such as SpiderOak (and a strong password with them).
Finally, once the installation on the 10.9.5 system is completed and confirmed, is there any point of keeping the 1.9.8 wallet?
nerioseole alluded to one above—Electrum 2.x uses a different wallet format. If you give it a 1.9.8 wallet file, it will upgrade it to the new format behind the scenes (the seed remains the same). If you ever want to copy this 2.x wallet file to a machine that has Electrum 1.x on it, you'll need to instead either:
- Use a backup from Electrum 1.x, or
- simply restore from the seed.