Below I have copied the error that I receive when entering a new repository into PyCharm (the same error is given in any IDEA IDE). This plugin installs from disk and works correctly, I am simply having a problem with hosting.
<plugin id="MyPlugin" url="https://www.auburn.edu/~ski0005/TDD/edu.auburn.eng.csse.tdd_jb.zip" version="1.0"/>
List of plugins was not loaded for following hosts:
Due to the following errors:
'org.xml.sax.SAXParseException; lineNumber 1; columnNumber: 55; White spaces are required between publicId and systemId.' for 'https://www.auburn.edu/~ski0005/TDD/'