Hi, recently highslide has changed its license, would have to review the features of mAvik as well as within the extension to show the current:
add link for pop-up window: Slimbox, Magnific Popup, uikit Lightbox, Highslide (for non-commercial sites - highslide.com/#licence);
Highslide JS is licensed by the MIT-license. This means that you can download and use our software for free, both commercial or non-commercial, as long as you’ve included the MIT-license in all copies or substantial portions of the software
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