I deleted everything from the server and started over with fresh files from OW Store.
It seems to install OK.
When entering the Aff ID and Whitelabel, it still goes to a white page with no content.
Hit the back button, it now says the values entered were saved. However, running a search in the cpanel file manager shows no file called data.json on the server. The folders are writeable.
If I then go to the site, its a white page, with one button top left (see attached file). I have to deactivate the plugin to get the site back.