Hi Brotherstone,
Thanks for reaching out and your favor for our product!
In case you are talking about the product Isolator for C#, the temporary license you get after downloading is valid only for 14 days.
Regarding how to update the license key, to continue using our product you should purchase a valid license.
I have forwarded your question to our sales department. They will contact you ASAP.
Thank you!
Regards,
Lilach