I actually have 2 issues with Native Access right now. I understand that NI is having load issues with their servers, but...
The main one is that "Analog Dreams" (which I own) just will not download. The error is a generic "download failed". And no, it's nothing to do with disk space or my network; I just purchased NI Picked Nylon Guitar (which is much larger at 6.4GB) and it downloaded and installed OK in a few minutes. So, all my other products are OK, except for "Analog Dreams".
NI needs to either fix NA/servers or give us back manual ISO file installers.
The second issue with NA right now is that (once again) it will NOT download anything at all unless I use a VPN to "pretend" I am in Germany (I am actually in Australia). No it's not my network settings - NI just won't allow downloads to Australia (and probably not to some other countries).
I complained about this (the VPN thing) months ago - the issue comes and goes, depending on something being wrong with the NI server(s).