Hey !

You can only download YES upgradation form after the release of first counsling. After the release of first round of counselling , you will pay the fees online and at the reporting centre , your seat allotment will be done. On the page of seat allotment only , you  will find two options , YES or NO  , click on YES to download the YES upgradation form. Or , you can also download it by clucking the extreme right bottom option of the window , captioned 'DOCUMENTS REQUIRED' . After clicking on it , you can download the YES upgradation form.

Hope it helps!