Sometime a Windows installer corruption or use of pre-release editions of Probate Plus may mean that automatic uninstallation of Probate Plus isn't possible during install or update of the application.
Probate Plus v5
To manually remove Probate Plus v5 from "add/remove" programs if Windows installer files locations corrupted or missing. Once removed from Windows "add/remove applet" you can then reinstall using your setup.exe file.
N.B.: Assumes C:\ProgramData
1. Examine C:\ProgramData and delete any PPv5 setup caches (some known examples below - these folders may be "hidden"):
C:\ProgramData\{C35528A3-F2A9-47EA-928A-9F110D0C46BA}
C:\ProgramData\{766A30B8-C734-4B44-BDB2-B4B36F232DBE}
C:\ProgramData\{EBFA1309-E12F-4BB4-98DE-A87E4E4DCA1B}
2. Delete registry key (if present):
\HKEY_CLASSES_ROOT\Installer\Products\4958928428309BF4EBFB0053322F17E7
3. (If 32bit Windows) check for and remove entries for "Probate Plus v5" under:
\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\
4. (If 64bit Windows) check for and remove entries for "Probate Plus v5" under:
\HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\