I should've explained this earlier but to be frank, I didn't expect you to rush into this immediately. So, that's how you do it:
Enter Knossos settings (gear icon in the topright corner), and in 'Knossos' section, change "Preferred engine stability" to Nightlies and mark the "Show engine builds in mod list" checkbox, hit Save, and go to Explore tab. Locate the FSO mod, and hit Update. (If you for some reason want to grab a specific, not the latest build, you only need to enter the "Details" page, change the version in the top left corner, and then hit Install. You could technically install every single previous build that way. But for you, just the latest should suffice, I think.) Once the downloading proccess is done, if you navigate to any mod's FSO Settings, you should have a new build to choose. You might need to carry over the settings, though (although there's a handy "Global flags" section in Knossos settings, with just as handy of a "Apply to all" button.
Although for the insight on how to use the improvements, I'd rather have someone from the FSO dev tam hop in with a quick explanation.