1. Install NSIS:

   cinst -y nsis

2. Go to NSIS Contrib folder:

   cd /d "c:\program files (x86)\nsis\contrib"

3. Clone nsis-lockdetector repo:

   git clone https://github.com/StreamElements/nsis-lockdetector.git

4. Open nsis-lockdetector\NSISLockDetector.vcxproj with VS2017 running in Administrator Mode

5. Build -> Batch Build -> Have the following checked:

   Release - x86

   Release - x64

   Release Unicode - x86

   Release Unicode - x64

6. The plug-in DLL will be deployed to ....\Plugins[arch]\NSISLockDetector.dll

7. Usage (NSIS script):

   SetPluginUnload alwaysoff

   ;;; Make sure to minimize the list of files to check

   ;;; since RestartManager is slow and gets slower the

   ;;; more resources it has to check.

   NSISLockDetector::AddWildcardPattern "$INSTDIR*.exe"

   NSISLockDetector::AddWildcardPattern "$INSTDIR*.dll"

   NSISLockDetector::SetMode "restartmanager" ;;; default = "pslist"

   NSISLockDetector::Dialog

   Pop $R0

   StrCmp "$R0" "OK" programs_ok programs_error

   programs_error:

   Abort

   programs_ok: