Hello Jai Ganesh Sridharan,
That is the correct link for the i.MX DDR Programming Aids. Thank you for letting us know that the i.MX7ULP Programming Aid is missing. You can find it on the link below:
https://community.nxp.com/docs/DOC-340303
I will ask the author of the i.MX Design and Tools document to please add this missing link.
My apologies for the inconvenience!
Regards,