Note that new forum member
skyfotos.net (Karl) has found the solution to this problem. (I initially wrote "The final solution," but realized THAT phrase has a very negative history and connotation!)
Apparently there
WAS something wrong with the STM GUI interface download for the Typhoon H as it appeared on Yuneec's download page, prohibiting the software from operating properly or connecting to the aircraft. Skyfotos.net (Karl) provided this link:
STSW-STM32102 - STM32 Virtual COM Port Driver - STMicroelectronics - STMicroelectronics (found in his thread on the Typhoon H Help page titled
"[SOLVED] GUI Connection...." posted yesterday) to a new STM GUI program download that fixes the problems found in Yuneec's errant GUI download.
Hats off to Karl. I downloaded the link he posted, installed the updated software, and the GUI was up and running as it should be, connecting fine with the Typhoon. A Yuneec tech I spoke with just days ago was clueless about this solution to
their problem. So I thank Karl for providing the correct answer to this problem that had so many stumped.