Lightbox not working

Hey, I’ve installed Envira Gallery Lite and the lightbox isn’t working; the image simply opens in the same tab.

I’m getting a JS error on load:

Consider using 'dppx' units instead of 'dpi', as in CSS 'dpi' means dots-per-CSS-inch, not dots-per-physical-inch, so does not correspond to the actual 'dpi' of a screen. In media query expression: only screen and (-webkit-min-device-pixel-ratio: 2), not all, not all, not all, only screen and (min-resolution: 192dpi), only screen and (min-resolution: 2dppx) (index):322
Uncaught TypeError: Cannot read property 'msie' of undefined envira.js?ver=1.0.8.1:8
Uncaught TypeError: undefined is not a function

and a Chrome warning when the image is clicked:
Resource interpreted as Document but transferred with MIME type image/jpeg:

Can’t offer links because it’s a client site, sorry. I’d appreciate any help.

https://wordpress.org/plugins/envira-gallery-lite/