Creaking isn't always from the bottom bracket cartridge. They usually last a long time and they are nearly impossible to install wrong. The right (chainring) side has left hand threads and the left side has usual right hand threads, so they can't be put in backwards. You'd have to ask your bike mechanic what he meant by his assertion that it was installed "wrong".Anyone found another bottom bracket that fits? I've ordered one of the $9 bikeinn brackets, but I'm skeptical. The other link above is for an ebay vendor who is on vacation.
Also, where did this size info (100/159.5) come from? I didn't see it anywhere on aventon info, and they haven't gotten back to me in eight days since I sent in a query.
If you pull your bottom bracket cartridge the size is printed on it. If you have the same bike as Dingo this is the image of his that he posted
Regarding the prior post that the following crank puller stripped the crank threads, that would only happen if it was used incorrectly.
It is a universal puller for both ISIS and square tapered cranks. These universal pullers have a disc at the bottom to use for ISIS, you have to remove it to use for square taper cranks otherwise the puller will just press against the inside recess of the crank and not contact the axle. If you use brute force then it will strip the threads from the crank. The second puller he listed might work but it isn't the right tool for the job.
Honestly, this forum is filled with misinformation posted by people who have no idea of what they are doing. Take any information available on this forum with a huge grain of salt. If you do replace the bottom bracket cartridge just buy the right tools (available cheap on Amazon) and watch an instructional video or two on how to properly perform the procedure.