Do you have a version of the SWF Live Preview software that's compatible with newer Windows machines? Win 7-10+? Or are you planning on moving away from Flash completely as it's now been deemed as "dying" ? There are still a lot of merit to the .SWF file format, such as studying old .SWF files. A thing I know a lot of people do, game developers and animators alike. It's like how people collect movies in old formats. And there are a lot of assets that can be extracted from the files too. A preview that works on new machines would be great for finding just that frame or short bit of animation you were looking for.
EDIT: It seems that you've moved away from Windows completely in favor of only having it run on Mac. Is this true? If so, why? And also, if it's true, do you have a new Windows version planned? More and more people are moving back to Windows now, even in creative fields, as those machines typically give more rendering power for less money than the same rendering power in a Mac computer.