Apologies, I was confusing my version numbers earlier- I'm actually on version 1511, and I've tried to update to .NET 4.7.2 already.
Then I'm afraid you don't have any other choice than to update Windows. The minimum version required for .NET 4.7.2 is 1607.
There's just nothing we can do because, even if you had an old installer (that would have to be installed with the network disconnected, to prevents updates) due to Esellerate closing in September, we had to switch to another ecommerce provider, and their software requires .NET 4.7.2 as well so, if you don't update Windows, you won't be able to reactivate any of our products after September.
