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)
You can find Endnote X1 install instructions here: https://support.clarivate.com/Endnote/s/article/EndNote-X1X2X3X4X5X6X7-Windows-Install-Word-CWYW-Toolbar?language=en_US
But
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
I recommend you consider buying the upgrade