We're aware of this issue. Unfortunately, the UserVoice portal was deleted shortly before we migrate to the new Feedback system. Therefore all previous link are broken and won't work.
We updated your account with some Telerik points in appreciation of your involvement.
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Feedback Portal
and vote to affect the priority of the items