Install SuiteCRM 7.11.15 on a shared hosting

File permissions don’t mean anything without the ownerships.

Unless your user and group ownership is correct, you won’t go very far.

Do you have SSH access?

In Admin/Schedulers, at the bottom, there are instructions about setting up cron, where SuiteCRM includes your web server-user name (which is what you should use as owner).

What do those instructions say, exactly?