I doubt that “old-style manual install” would work on a shared host either - you need full SSH access to be able to do things like install stuff like RVM, Redis and Postgres. Your best bets are:
- Abandon your shared host and get a VPS ( These are pretty cheap nowadays for quite alot of welly even $10-20 a month gets you enough oomph to run Discourse ) Then you can do either Docker install or manual install
- Use Discourse’ own hosting options [here] ← see jeff’s post below
- A cloud based install on something like Heroku? Not sure about this but it sounds like you should be able to do it bu following the cloud based install
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