First you will need to find out which continuous release series the part originated from. I think there is 1847, 1872, 1899, 1926 AND 1953 series of nx. So if you download and install the 1953 with the 1969 latest and greatest release that is within the 1953 series you should be good. Hope this helps.
To Download you have to go the support center, Used to be known as GTAC< and setup your account. Google search for GTAC and it will take you to the appropriate pages. Then you should be able to download everything from there.