ISSUE: After successful installation of SACS 5.5, when you try to run the SACS 5.5 V8i (SELECTseries 2) Executive, you may get a message "Please install the Bentley Integrated Structural Modeler".
RESPONSE: Please note that this is not an error message, it is a warning. This is an indication that you have not installed Structural Synchronizer; it is a requirement if you want to export/import to ISM.
This is not a prerequisite, but a separate installation. Download it from the Bentley site and install it; follow the steps as mentioned in the page below.
https://communities.bentley.com/communities/other_communities/sign-in_assistance_and_web_services/w/wiki/30658/software-download-instructions
If you do not install it, SACS will still run but you won't be able to export/import to ISM. ISM and Structural Synchronizer allow you to export accurate steel detailing information from SACS to ProSteel and other programs.