If you are having problems updating to iBird 2.2.1 try uninstalling iBird, then use a File Explorer app such as Astro (it’s free) to locate and remove the iBird_Pro folder. (To delete the folder hold your finger over it until a menu appears to the side, then tap delete.) Then try reinstalling iBird. Your app purchases are tied to your Google Play or Amazon account and can be installed a number of times free of charge.
You will need a Strong WiFi connection to load iBird.