Workaround: Keep a copy of NAT 1.3.492 folder (Nat folder). Install last version of Nebula and then move the old NAT folder inside your installation Nebula folder with other name (for example Nat 1.3.492). You will have now 2 NATs last version in Nat folder and old NAT in Nat 1.3.492 folder.
Enrique Silveti. Acustica Audio customer and technical support.