You shouldn’t need to export your keystore file just to update the wallet. You can just run the installation and your existing wallet will be loaded into the Desktop Wallet application automatically. Here’s the docs for updating the wallet: https://docs.aion.network/docs/updating-the-wallet
I’m not sure why the wallet isn’t letting you export the keystore file. The password you enter in the Save Keystore screen doesn’t have to be the same as the one you used when creating your wallet. This new password is used when importing the keystore file into a wallet. Here’s the docs for exporting an account: https://docs.aion.network/docs/export-an-account
Saying that, you don’t really need your keystore file if you have your Mnemonic Seed Phrase:
- Click Add account .
- Under Recover from seed , enter the Mnemonic and a new Password.
- The recovered account is now shown under the Accounts tab.
Let me know if you get stuck.