Hello Evangelmike,
We're sorry for the trouble you had with the registration of Adobe Reader DC, please reboot the machine once and try registering Adobe Reader DC again.
Is it possible to share the screenshot of the window where you are not able to find the 'Accept' button? To share the screenshot, refer to https://forums.adobe.com/docs/DOC-7043#jive_content_id_How_do_I_attach_a_screenshot
Refer to the following Adobe article and try the suggestion Can't accept end-user license agreement and launch product
If you are able to launch Adobe Reader by closing the Registration Windows, then check for the dot version of Adobe Reader installed from help>About Adobe Reader or you can also refer to the steps from Identify the product and its version for Acrobat and Reader DC
Let us know how it goes and share your observation.
Thanks,
Anand Sri.