The August 13, 2019 Windows Update KB451250 for Windows 7, 8.1 and 10 can cause many applications including At Your Service to stop responding or present an error “Invalid Procedure Call” when run. Microsoft is aware of this issue and has provided additional patches to fix the issue.
If you are installing a new version of At Your Service – Repair Centre, you may see the message “Windows Defender SmartScreen prevented an unrecognized app from starting. Running this app might put your PC at risk.”
You can safely run the installer with the following steps:
After a Windows 10 operating system update, a previously licensed version of AYS displays the message “This is an evaluation edition of At Your Service”.
After a Windows 10 operating system update was installed (either automatically or manually), when starting a previously licensed installation of AYS, you see the following messages: