I know that we cannot stand still but not everyone can afford to keep up the quick pace.
"Quick pace" ? Are you aware Windows 7 support ended 5 YEARS AGO ? That was the mainstream support, basically Microsoft support stopped answering to user support questions in 2015, but they kept releasing security updates for it.
What will stop in 2020, will be the extended support, so even security updates will stop.
I cannot possibly answer what will happen by that date. We won't do anything specific in OUR code to *prevent* it to work under Windows 7 but, it's very well possible one of the updates to the MS compiler we use might, and we really have no way to tell this for sure.
This means, from January 2020, you'll be on your own. It might work or not, we won't test for it. It might work for a while, and then might stop to work but, after January 2020, we won't offer any support or do any fixes, just to adapt our software to run under Windows 7, assuming a fix would even be possible, which we won't investigate any further either.
So, basically, you might get lucky, and still be able to use our products in Windows 7 after Jan. 2020, but they might stop working at any time and we cannot offer any guarantee they will after that date.
Even if you make a backup of all the installers and stop updating them with the Live Update ( and be forever cutoff from updates ), sooner or later you might change some hardware, or update the BIOS, or reinstall Windows, and in that case we cannot guaranteed a reactivation will be possible, since the activation server itself might have been updated, and it might not support your old Windows 7-compatible software.
As I've said, the only way to be SURE you can keep using our products in the future, is to update to Windows 10.
And, before you say we don't cater to old customers, I have to remind you we just
updated THE FS9 ADDON MANAGER to work with the new activation system. That one was even older than Windows 7 itself ( FS9 came out in 2003, Windows 7 in 2009 ), yet we updated it as well, because we do what we CAN to allow even very old customers using product bought 10 years ago, that's how FSDT works.
But there's not much we can do about the OS itself being obsolete and, in fact, even the FS9 version of the Addon Manager will likely require Windows 10 at some point.