The second option is to uninstall old wallet and then install a new one, but in that case, you need to have your seed (12 words) to recover the wallet. You need to select the option "I already have seed" in the process of creating wallet.
I recommend you try the first option, but before anything be sure that you have seed words. You can check them by clicking on tab "Wallets" and select "Seed".
uninstalling doesn't remove the wallet files.