I have a very small MSI/EXE windows installer application.
Would need to add a validation module on top of it. Something like a softwares license check.
This is just to check the existing TEXT string from our webfiles via URL POST request. If it match, then it will continue to install
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Sir I have done this before for my local client .He had same requirement like send entered key to server and get validate then proceed to install software , so I can do the same for you in one day.