Hello. I do not see any picture attached. And I have not found an answer to any of my questions. Can you please attach the missing picture, and also answer my questions, without it I cannot help you. Here they are again:

• The full build number of QuickOPC 5.21 (e.g. from 1st page of the installation program)
• Does QuickOPC work correctly when you use the installer on the target machine? (I understand the answer is Yes here? - need confirmation)
• If you do not use the installer on the target machine, which C++ runtime are you installing
yo

urself? (URL please).

And additional questions:

1. When you say "I install license manager", what precisely do you do? Are you running the QuickOPC installation in the "Express" mode, effectively installing not only the License Manager, but also the rest of QuickOPC? Or are you installing it choosing a Custom installation type and selecting just the License Manager? Or how?
2. What is your main problem? Is it that you cannot get your program to run withoutt "installing the license manager", or is it that, if I understand it well, the uninstallation of QuickOPC breaks the app?

Note that the installation puts QuickOPC assemblies into the Global Assembly Cache (GAC). If you build your app, then usually Visual Studio will realize that the assemblies are in the GAC, and does NOT copy them alongside your app's EXE. But when you distribute your application, you should distribute the QuickOPC assemblies as well, and put them either alongside your app's EXE, or into the GAC. If you do not put them alongside your app's EXE, then with QuickOPC installed, your app will work because they will be found in the GAC; QuickOPC uninstallation will then break any app relying on these GAC assemblies, because the uninstallation removes them. This might be obvious but I wanted to mention it anyway, because the symptoms would be close to what you are describing.

Thank you

Hello. I am sorry but I do not fully the nature of the problem at the moment. Can you please clarify:

• The full build number of QuickOPC 5.21 (e.g. from 1st page of the installation program)
• Does QuickOPC work correctly when you use the installer on the target machine?
• If you do not use the installer on the target machine, which C++ runtime are you installing yourself? (URL please).

Thank you

Alright, I assumed that when you asked about the license and License Manager, that the problem is in the licensing area.

But it isn't.

If the problem was with the license, the symptoms would be quite different: Your program will run, and after 30 minutes, you will get an exception indicating the the trial runtime is over.

Have you followed the "Application Deployment" instructions from the Concepts document? There are some pre-requisites that must be installed; such as Microsoft Visual C++ runtime libraries. Those installers come directly from Microsoft, but they are truly requird - there is no way you can run just your app on a clean system.

The actual versions of what's needed depend on the version and build of QuickOPC. If you were using version 5.20, for example, the MS runtimes have changed in version 5.21. And, just recently we have made a change to back-support Windows XP, based on new libraries that Microsoft has released, and that means a different MS installer too. The correct should always, be, however, in the Concepts document that gets installed with the version and buid you are using.

You do not necessarily need the License Manager. This document (licensed users only) describes how to do it.

The document talks in terms of installation program, but if you like, you can make the same actions at the beginning of your application instad. Just make sure they are done before you use any of the QuickOPC types. Note that admin rights may be necessary to modify the registry.

The license information, as stored on the computer, is cryptographically protected against modification. That is, one cannot change e.g. the Subject (licensee) name, without invalidating it. The purpose of having it stored the way it is is twofold:

• It can be easily determined whether licensed QuickOPC is being used on the particular computer or not.
• If it is used, it can be determined where the license "comes from" (which license it is).

Best regards