That’s all great but those iCal files are being generated by clicking on The Events Calendar export buttons. The average user can’t be expected to know how to (or be inclined to) open the file and edit it. It doesn’t make for a great user experience. This is clearly and issue and is more than likely affecting other users too.
If this function in The Events Calendar Pro doesn’t work, then we’ll have no option to diable it until a bug fix is released.