I tried today to upate my SP 188.8.131.52 to the latest version (184.108.40.206).
The installation failed because it was 'Unable to replace file "C:\Program Files (x86)\Sticky Password\spCapBtn.dll")
I was also unable to delete this file manually, even logged in with the Administrator account. I have also tried 'Unlocker Assistant', but it seems to be a permissions issue. On the Advanced Security tab of the file Properties dialog, it says 'Unable to display owner', and I am unable to Take Ownership in order to delete it.
I tried uninstalling, and this has removed all files except "C:\Program Files (x86)\Sticky Password\spCapBtn.dll". The only way I can now reinstall the program is to change the installation folder to ..\Sticky Password 2\