Two things ... "softaculous' and 'shared hosting' ...
Maybe the reason one cannot find much on 'shared hosting' is because it's not good environment for Moodle.
May not be able to install nor configure software for document conversions needed for grading ... ghostscript, unoconv (python), and certainly not the 'listener' service as those would be server wide ... all customers on the shared host.
Think, with shared host, you will have to try using Google for document conversions ... and if that doesn't work ...
seek better hosting.
'SoS', Ken