The 'Request' one is the .SER file you uploaded. The 'License' one is the INIT N2P and N2V files. The 'Installer' is what I believe you're looking for! It might be in a separate email, or you can manually download it from your Dashboard.
I think i may have actually made a mistake when purchasing as I've purchased the Nebula pro bundle upgrade for 60 euros. I thought it was an upgrade from the demo version. I noticed earlier that you can buy the Nebula pro bundle for 139 euros. Does this mean i needed to buy the Nebula 3 light before buying the pro bundle upgrade? If so, the Nebula light is unavailable so will i need to get a refund and then buy the Nebula pro bundle for 139?