In light of the Circuit Tools 3 problem discussion, I wanted to repeat my strong support expressed back in April to not remove VBO export.
First, while I sometimes do see the CT3 file checksum error, it is hit or miss. I find that disabling automatic ideal lap generation reduces or eliminates the error. So CT3 is NOT a reason to deprecate support.
But the biggest reason to keep it is I finally just figured out how to properly export VBO with attached videos from RaceChrono that are opening just fine in Circuit Tools 2 and 3. All this time I have been using a 3rd party utility to manually join the VBO and MP4 files, when it looks like I was just doing the export procedure wrong in RC.
I never really dug into video export given all the user comments in this forum about how Vbox video export was broken and won't be fixed. But in current 9.1.3 I am getting perfect synchronized video exports. Trick is to set the Video Channel on the export screen.
So please please keep the VBO export function.