The WinEdt editor is a popular shareware editor for LATEX documents. It has been licensed for a limited number of users in UCC, so this page is restricted to access by UCC computers only.
If you want an unrestricted (Open Source) editor for MikTEX or TEXLive, you should look instead at TEXnicCenter or TEXstudio (formerly TEXmakerX), or use an online service such as Overleaf v2. (formerly ShareLATEX)