It’s recommended that you always have the latest version of your purchased digital products. Plugins and themes by nature are bound to have issues. When these issues are discovered, I quickly push out a security release or an update patch to fix the issue.
You don’t need to be WordPress expert or dive into the code to update your theme. Moreover you can get theme updates in fully automatic way! This is more secure and convenient rather than re-uploading your theme folder each time the update is out.