Getting old version of Ghostery for Firefox

The latest version of Ghostery is not compatible with the Firefox I am using, which is
Firefox 45.9.1 Some older versions of Ghostery are available for download at this link.

https://addons.mozilla.org/en-US/firefox/addon/ghostery/versions/

After downloading one of these from the link given how can I install it as an extension to the Firefox browser. There are also links to Github on this page for older Versions of Ghostery.
Drag into a blank tab place and it should install :)
 
Thank you - it got installed but it is not working. The oldest versions shown at the above link go back only up to Sept. 2016, and there it says I need to have Firefox 48 and later for it to work. Since I use Firefox 45 I need help to find Ghostery versions earlier than 7.0.0.113 (Sept. 2016).

Github has this page - https://github.com/jonpierce/ghostery - but I just can't find the file there.
 
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