If the package remains in Add/Remove Programs even after deleting the package

Problems like this can appear if some registry entries are corrupted after doing a lot of testing on the same machine.
You can solve the problem by removing the registry in the Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\CodeScroll Controller Tester 3.x path or by using an uninstaller such as geek uninstaller.