DevSuite installer uses "REST services in JBoss Download Manager" explained here https://mojo.redhat.com/docs/DOC-940689.

DevSuite Intsaller follows the explanation for tc-accepted entry point code is here. It uses file from previous CDK release (published in cdn and available through download manager) to do verification:
1. that provided credentials are valid;
2. that required T&C's are signed.

There are two major use cases for developers installing DevSuite using Installer:
1. Direct download - when developer sign in to developers.redhat.com and download installer himeslf;
2. Shared installer - when someone share installer with developers without account.

There two kind of users involved in those scenarios above:
1. New users that must go through registration process;
2. Registered users.

Direct download

For new ones registration process is really simple now. After creating RHD account and downloading installer there is no additional steps to get through installation.

For already registered users there could be problems related to T&C's and authentication reported here https://issues.jboss.org/browse/RHDENG-579.
So far there are two kind of problems:
1. Users can login and download DevSuite installer, but cannot use the same credentials to install;
2. Users that can login in to developers.redhat.com and get request to sign additional T&C's but credentials for the same user in DevSuite Installer reported as invalid when REST tc-accepted entry point is used

Shared Download

In this scenario new users without account can press Register link, then go through registration process in browser return back to installer and use new account credentials for installation.

Registered users could need to sign additional T&C's if missing and would be good to show external link to do so. Current entry point tc-accepted does not provide any hints where missing T&C's could be signed.