The End User Licence Agreement for Stitchmastery allows you to install and use the software on two computers. These can be different operating systems. Hence the supplied activation key is valid for two activations. If you replace a computer and need another activation, then please contact email@example.com for an additional activation.
A copy of the End User Licence Agreement is supplied with the software. To view it;-
On Windows and Linux systems, from the main menu bar, select Tools > About Stitchmastery.
On macOS systems, from the main menu bar, select Stitchmastery > About Stitchmastery.
The About Stitchmastery dialog opens.
Select the 'License' tab.