The installer for the ISM applications is called "Structural Synchronizer" and must be installed to utilize any ISM link from any application. It can be downloaded from the Software Downloads, also known as the Fulfillment Center, like any other product. A valid sign-in with the Product Download role is required.
First open the CONNECTION Center, also known as the Personal portal https://connect.bentley.com
Then click on the Software Downloads tile.
Type part or all of the word "Synchronizer" in the search field and select "Structural Synchronizer CONNECT Edition x64". Note, use the American English spelling here, "z" rather than "s" in Synchronizer.
Once found, expand the All Downloads list and select the appropriate version:
Click the Blue Download arrow button and save a copy of the installation file.
Starting with V8i SELECT series 5 (version 126.96.36.199) Structural Synchronizer was available in a 32 or 64 bit variety and the version installed must match the computer operating system. Starting with the CONNECT Edition, only a 64 bit version is available.
For non-SELECT users, the Synchronizer may also be downloaded from the iware downloads.
The Software Downloads center can also be used to download the ISM Revit Plugin, or other ISM Enabled applications from Bentley Systems.
Can't Install the 32-bit Version on a 64-bit Operating System