At the March 19, 2021 I bought the Regular version of jQ plugin for 30$. It's my fault that I haven't read the License agreement carefully and I read it after buying the regular License. As I understand the License Agreement - If I use the plugin inside the web-site that I'll sell to my customer I need to buy lifetime License. So can I upgrade Regular to Lifetime License.
And the second question - my customer need the documentary proof that he use your software legally. Can you provide me some kind of such document?