Firefox Setup 2.0.0.7

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I have been trying for several days to install the latest version of Firefox. Here is a list of my various attempts, any help is much appreciated.

Normal 'online' update (Firefox Installer.exe) - Fails about 90% of the way through the installation. Throws an error message 'Hmm. For some reason, we could not install Firefox. Choose OK to start over.'

Full download version (Firefox Setup 60_0_2.exe) - Installation never starts, no screen ever shows, even after hours. Task manager does show Firefox Install running though nothing ever happens.

I am on a work AWS client so I do not have full Admin rights to the machine, but all past versions install fine with my 'Elevated Permissions'.

Mangal font download. Have also tried using 7-zip to pre-extract the files from the exes, same results for both. Also have followed the instructions from the Support site to do a full uninstall, manually remove all directories, run Disk cleanup, then install.. None of these have worked.