There are no button on settings to enter license key

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Where I need to enter my license key?

Hi,

The support for the PRO version is not here, but on our website – https://maxbuttons.com/forums/

It looks like you are using the free version of the plugin. To use the PRO version, you’ll need to download it from our website. You can find instructions in the email your received, or look here – https://maxbuttons.com/my-account/

I’m sorry, but the author cannot support customers or field pro questions on this site. They are not allowed to.

For pro or commercial product support please contact the author directly on their site. This includes any pre-sales topics as well.

As the author is aware, commercial products are not supported in these forums. I am sure they will have no problem supporting you there.