Due to its age, you probably need to try to install them manually – note there are some things that won’t work (make sure you also read the second link below)
Endnote X1? They are on Endnote X8 and X1 is from circa 2008 - so you are talking about 10 year old (unsupported) software and the last time they tested it “informally” was with Windows 7. See