Missing assets/javascripts/ folder

I have some errors and am unable to get this plugin working. I’m wondering if the javascripts folder is missing, as indicated by the warnings logged, see below. Maybe other files are missing? Is there a place to find older versions of the plugin and try to piece it back together? This plugin looks very promising if I can get it to work, thanks.

[08-May-2019 19:47:04 UTC] PHP Warning: file_get_contents(/nas/content/live/nehassotest/wp-content/plugins/fusionspan-memsuite-single-sign-on/assets/javascripts/tr.js): failed to open stream: No such file or directory in /nas/content/live/nehassotest/wp-content/plugins/fusionspan-memsuite-single-sign-on/Views/Render.php on line 35