This appears to be a local PC issue. Tested it on two PCs, one low-end. It exported flawlessly on both. Download the result from the link above.
8.99 appears to be within the six-month free upgrade period after purchase of your current version, so you should be able to install it and use your existing registration.
Some things to try...
Reboot the PC.
Verify that the video driver and Direct-X are up to date... https://www.nch.com.au/kb/10265.html
Test the project on another PC.