Changing the Unique Headers Single Posts plugin

My site is [login to view URL] The site works on WordPress 4.4 in Hebrew, using the Weaver Xtreme theme The site has 77 active plugins. The site has installed the following 2 plugins which are relevant to the project The Unique Headers plugin [login to view URL] This plugin adds the ability to use unique custom header images on individual categories. For example: [login to view URL] and the Unique Headers Single Posts plugin [login to view URL] This is intended for use with Unique Headers plugin. It forces single posts to grab the first category from the post and use that as it’s header image for the post. It does not work on my site. See [login to view URL] What I want freelancer to do: Freelancer should supply an amended version of the Unique Headers Single Posts plugin, as a zip file for me to install on my site. Freelancer will have access to a copy of the live site at [login to view URL] Freelancer will have 48 hours to complete the project. Freelancer will get paid 7 days after submitting the work, to allow for testing. Freelancers' work should stand theme and WordPress upgrades