hi there , please re-download the new ALFA wallet here https://github.com/alfapr0ject/alfa/releases/tag/1.0.0.1 
Before install new wallet please delete old alfa folder on user/appdata/roaming/alfa ( delete alfa folder) because this is new chain/genesis with new port.
If you have available balance in the previous wallet, please take screenshot of your balance before delete everything so we can pay you back your coin.