While testing MPOS changes I had to do an uninstall on my laptop. But every time I tried to uninstall it told me that there was an error and it couldn’t complete the uninstall and that I should contact the administrator. And then it reappeared in the list of installed apps. Trying to run the Uninstall-RetailModernPOS.ps1 gave a hint of what’s wrong: You’ll usually find the script around here: C:\Program Files (x86)\Microsoft Dynamics 365\70\Retail Modern POS\Tools\ There might be some clever way of fixing this, but in order to move forward I did a quick’n’dirty and not recommended way of fixing it: Remove the check … Edit the script by commenting out this line: This is not recommended and definitely not in a production environment and I do not take any responsibility for any undesired outcome of this. But it did the trick for getting me forward. Please note, that this doesn’t take away the error. So when you uninstall the next time it’ll still throw the error at you until you once again remove the check.