At present, there are no plans to make WriteMapper available on any of these platforms. The only way you can download and purchase WriteMapper is directly from this website itself.
This helps us support our customers in being able to use their purchased licenses across platforms. With licenses purchased from our website's store page, customers can transfer licenses to another computer (even if on another OS) in a pinch if needed, as well as make that transfer in the case the customer deciding to entirely switch platforms from macOS to Windows or vice-versa.
This allows us to continue having your purchase remain valid and active for use over a more durable amount of time for you.