The website says that the download is available in the forums but I can’t find it… ;-(
The Bridge Engine is available to only those who have purchased the Bridge. If you have, you can easily access the latest version of the Bridge Engine within the “Getting Started with Bridge” email. Once you have setup your developer portal login, you’ll have access to the latest releases of both the Bridge Engine and Structure SDK.
If you have purchased the Bridge, but have misplaced your “Getting Started with Bridge” email, please reach out and I can get you sorted.