Can someone point me towards the download link for the LabVIEW 2015 development system? I have tried searching but cannot for the life of me find a download link that isn't a patch.
Sadly, NI doesn't provide LabVIEW for Linux as a download. It's probably because the Linux version doesn't include licensing, so anyone who has the installer can use it without having to activate it, unlike with Windows where you can't use LabVIEW without activating it. I believe the Mac version of LabVIEW also doesn't have built in licensing.
Your best bet is to contact your NI sales representative and ask them to send you installation media.