The Campaign Management Plugin (https://github.com/bramley/phplist-plugin-campaigns/archive/master.zip) installed without error messages, but I don’t see a navigation link to use it. I have phpList 3.3.1, and these plugins:
Name Campaigns Plugin
version 2.3.1+20170625
Name Captcha Plugin
version 2.1.0+20161129
Name CKEditor plugin
version 2.1.3+20160603
Name Common Plugin
version 3.7.1+20171111
Name FCKeditor plugin for phpList
version 0.2
PHP 5.4.45