When a product is discontinued, we will support it (software/driver updates for new operating systems etc) for 2 years past the discontinuation date. I’ll need to check when the Forte was discontinued.
Even with current products, we only ‘officially’ support current operating system versions plus the previous version of said OS.
As you can imagine, it’s nigh-on impossible for us to test ALL historical versions of Windows and OSX when we have to update software for a new operating system. So whilst generally it will be fine unless Apple/Microsoft choose to issue some serious change, as I say, we only ‘officially’ support current and the previous version.
Whenever a new operating system is issued by Microsoft or Apple, we always test all of our products, including a number of popular discontinued products and publish a full list of our findings, such as the below:
https://support.focusrite.com/hc/en-gb/articles/115005393865-Focusrite-product-compatibility-with-Windows-10-Fall-Creators-Update-
As you can see, Forte is still working nicely with the latest Windows 10 update, although there are some issues with some programs that utilise WDM such as Skype.
That being said, with both current and discontinued products, our Tech Support team will ALWAYS try to help with any issues found, so whilst they might not be able to guarantee a software update for an old OS or a discontinued product from 10 years ago, if they can find a workaround, they will.
Si // Focusrite
p.s.
Official wording of our Support Policy:
"Our team of technical support engineers offer free worldwide technical support via e-mail and Livechat and are available to call in the UK, Germany and US on local rate phone numbers. This support is offered for the lifetime of your product. The only exception to this is with regards to software drivers and other software where due to the ever changing OS platforms we aim to support all products for at least two years beyond the point the product is discontinued (no longer available for general sale), unfortunately it is not always possible to offer support in the form of software and driver updates beyond this period. There is, however, no limit to the time our support team will be on hand to help you get up and running and overcome any technical issues you have using our products."