Paid LINQ 4?
I would like to upgrade my license to be a paid v5. I go to the page suggested and it says I can find out what kind of license I have but it requires that I enter an activation code. I don't know what it is and am not sure how to find out.
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https://www.linqpad.net/licensing/
If you no longer have access to your email address, please contact customer support and you may be able to regain your license if you can provide additional evidence of your purchase.