For Annual Passholders - I did it through the "Tink link" as well.
After logging in to the Passholders page, go to Events and Special Offers. Scroll down, click on the "Passholders! Enjoy Early Registration for runDisney Events" header. Click the link in the paragraph of the Tinker Bell Half Marathon Weekend subheading. That should bring you to the page where you can click a link to begin registering, either "Expedition Everest - INDIVIDUAL" or "Expedition Everest - 2 PERSON TEAM". If the "Tink link" leads you to a page that says "SORRY", try deleting the part of the link that says "sorry/", and hit enter to reload the page. This worked for me after a couple of tries. Alternatively, you can probably just re-click the "Tink link" from the prior page a couple of more times, and it should load up eventually.
I just re-created this process, getting the "Sorry" page several times, but after reloading the page, the links came up and I was able to get in to the actual registration page.
EDIT: I just went through the same process again, and it took about 8 attempts at reloading the page from the "Tink link" to actually get off the "Sorry" page and actually see the registration links. Just keep trying, and it should go through eventually.