Earl was able to add some code to the Structural routine and as long as Eduardo is on a Collaborated model it works.  The reason it only works for a collaborative model is because you can only have worksets in a collaborative model. On Wed, Jul 22 at 10:37 AM , Eduardo wrote: Revit PEC "Load Structural Worksets" Not working whenever I try to run it.

Remove the .dll files in PrgramData > Autodesk > Revit > Addins > 2019 > Pheinex > PEC Shared.  Remove the Z .dll files in ProgramData > Autodesk > Revit > Addins > 2019 Run both programs. It may ask to uninstall so select uninstall. Install again. \\ictsccm1\sources$\Greg_Shunk_Installs PECRevitMechanicalInstaller_v_1_4.msi RevitPECInstaller_v1_13.msi Double check above paths to make sure .dll files were installed.

Had to remove current Hotfix and reinstall it again. https://knowledge.autodesk.com/support/revit/troubleshooting/caas/sfdcarticles/sfdcarticles/Revit-could-not-find-or-read-references-What-do-you-want-to-do-dialog-appears-for-specific-computer-when-opening-BIM-360-files-in-Revit.html?mktvar004=1014180&utm_source=accounts-uhm&utm_medium=referral

When updating to version 16.9 of the desktop connector it is common to get this error You will want to be sure to check your desktop connector and take a screenshot to see all active projects you have selected (you will have to re select and sync projects once this error is resolved) for example: once you have done this completely close the desktop connector open up the file explorer and put this in the top bar %UserProfile%/DC  delete all contents in this folder then re open desktop connector and select projects source: https://help.autodesk.com/view/CONNECT/ENU/?guid=Cleanup_Bad_Drives