If you are searching for a direct link to download the full diagnostic suite, you will likely hit a dead end on the official Bosch website. There is a very specific reason for this:
Authorized Bosch eBike dealers only. Requires a paid license, dealer login, and specialized USB interface cable. bosch ebike diagnostic software download
: Access to the Bosch Dealer Portal requires a certified account and a unique login, which is only granted to bike shop owners and mechanics who have completed official training. If you are searching for a direct link