Txadmin enable on existing server

Hello, is it possible to add txadmin to a pre-existing server that was made before the txadmin installer? If so how would I go about doing this? Thank you! PS: I’ve tried just adding the new files, but it registers it as already installed bc I still have all of my stuff in it.

Ok disregard this, I got it working, but now whenever I go to the website it just says “Invalid request” on a white screen.