I’m not sure what’s going on with the audio on your end. Plays without any issues on my end and I haven’t heard anyone else mention audio problems yet. Maybe try re-downloading it? The audio is from the laserdisc and no splices have been made apart from the correction of a musical glitch that made it into the LD release. (the details are available in the first post of this thread). My vhs did have the overture (an early 90’s copy, part of the set with the enterprise picture puzzle on the side).
I’m glad you enjoyed it. I hope you’ll try a re-download and hopefully the audio issues resolve for you. Another person had problems with some video glitches that were resolved by him re-downloading it.