Kennon1st can you copy the logs from
<flarum>/storage/logs and send them to me ? We can move this discussion to email or Discord if you prefer.
Just looking at the content of your posts, you might be using two different urls (Wordpress at www subdomain, Flarum at bare domain). This counts as different domains and won't work unless you configure the cookie options. The solution might be to just configure the two apps to use the same canonical domain. Either www or no-www, but not mixed.
You should also configure Flarum properly without a
public folder in the url before installing extensions. You'll need a folder alias or use the "customizing paths" instructions of the Flarum installation page.
Not at this time. But if that's your only option and you're okay to pay for one year as a one time payment, I could give you direct access to the private package.
When Extiverse replaces flagrow.io, hopefully later this year, this might be a feature. But I have no control over that.