Does this Neutron 4 crossgrade work?

I don't see why it wouldn't, it says "any paid iZotope product".

I'm somewhat interested in this deal too, but at some point I was looking at going to the Music Production Suite they have, which includes both Ozone and Neutron. The thing that I'm not sure about in my case is whether iZotope's loyalty offers are affected by how many programs you own. If the upgrade to Music Production Suite will always be the same cost regardless of whether you own just Ozone or both Ozone and Neutron (I suspect this might be the case), then it doesn't make sense to buy both separately because if you do want to go up to the MPS later you wouldn't get a benefit from the second purchase. From the list price, there is no difference between upgrading to MPS from one product vs two products, but it's possible that the loyalty system on their site is a bit more personalized and works differently.

mducharme said:

From the list price, there is no difference between upgrading to MPS from one product vs two products, but it's possible that the loyalty system on their site is a bit more personalized and works differently.

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Trust me, they're not that sophisticated. Unless they have closed the loophole, you can basically buy an "upgrade" for any suite and redeeming the serials on Izotope's website gives you the full product suite.