One of the drawbacks of this installer is that it completely ignores your platform requirements. As such it's not a surprise extensions can't be installed ?
Disclaimer: As this is not an installer maintained by the Flarum team, it's beyond our scope of support. Any questions you have related to it and installations using it are the responsibility of the author.
I'm still in doubt whether to close this thread completely, I'll leave that up to our community manager @jordanjay29 . The best thing to do @[deleted] is to reach out to @ChristopherKhawand personally.
