If you deployed .NET Windows Forms projects from earlier releases of PowerBuilder, you must make sure to complete the following steps before redeploying the same projects from PowerBuilder 11.5:
Uninstall earlier versions of PowerBuilder runtime files (system assemblies and win32 DLLs) on all deployment computers or servers
Install the PowerBuilder 11.5 runtime files using the Runtime Packager or another tool, as described in the “Checklist for deployment” section of the Deploying Applications and Components to .NET book
