Returns True if files from previous session are found.

A Boolean value.  

object.PrevExist = value

The PrevExist Property syntax has these parts:

This is read-only property you can use to determine if Update method can be called to perform update. You should use it to determine if there are "leftover" files from previous session, where files are downloaded but never have been updated.

Although you have PrevDetected event that will fire soon after wodAppUpdate is initialized, you can use this property immediately after initializing wodAppUpdate to speed up the process.