There is no simple solution to this, if you have removed the download-button and also set "prevent right-click", which is a global javascript that we can't apply on a per-page basis.
There are some options, for example by creating a "download" button for images in specific folders. Unfortunately, there is a small issue with this currently, because there is no dynamic {path} variable. You can read this post, which has a complicated fix:
https://forum.photo.gallery/viewtopic.p ... 256#p40256
I will fix the above for next release, but that might be the only solution, unless we add new settings to NOT prevent download on certain folders. I certainly don't want to create a complex toolbar-configuration for each and every page ... That's just not practical for anybody.
Will add to my list and give it some thought for future updates ...