I spoke with our Support department and they recommended trying this:
1. Open Add/Remove programs, select System Integrator 5 (5.1) and click [Change]2. Choose to [Modify].
3. Click Visio Add-On and select "Entire feature will be installed on local hard drive" and then finish clicking through the install wizard.
If this does not work, or you don't see the Visio Add-On option when attempt the Modify, then you will need to:
1. Uninstall the SI 5 desktop components via the SI 5 Install Utility (Start->All Programs->D-Tools->Insatll Utility.
2. Reinstall SI 5 from disc, make sure that you choose the Complete option when installing.
3. Run your update to 5.1.
You cannot take a project that was created in SI 5 and bring it back to SI 4. If you need assistance, please call D-Tools Support at 1.866.386.6571 x 2 or email
http://www.d-tools.com/support/submit-an-issue.html. We are open on President's Day.