Try this NO IDEA IF IT WORKS OR NOT:
Go to https://github.com/pilsnerbeer/multisig-tool-fixed and under code download the zip file
Unzip the file to it's own folder by default by default it should put it in a folder called multisig-tool-fixed-master
In there there is a file index.html

If you do not have the chrome browser installed, get it from https://google.com/chrome

Once installed run it with the --allow-access-from-files parmamter and the index.html file

https://stackoverflow.com/questions/18586921/how-to-launch-html-using-chrome-at-allow-file-access-from-files-mode

-Dave