You need to make sure you install the application after the files are uploaded. Which is in your ACP > Manage Applications & Modules. On the right, after you upload your files you will see a button that says install with the application your trying to use. After that it will be put into your applications tab up top in your ACP and you can edit all the settings there.
If you purchase any type of package or license it will be with the IPS Homepage. http://invisionpower.com You will then need to come to the forums. Make sure its the same email... Log-out and then Log-in. This should fix your account forum side.