Short as i am on the road,
1. Never. Sorry. Windows just sucks monkeyballs.

2. If you have an MK1 and it is 100% working, no busted knobs/buttons etc, stick with it as 99.99% feature set match with the MK2 implementation. Only defferent layout , which is a matter of taste. You only miss one extra stepped knob for frame by frame navigation, which is only on the MK2.
If you have no APC40 yet or you MK1 died, get the MK2 as is new (with warranty) and shiny and smooth knobs and can be bought anywhere . And durability wise the APC twins are hard to beat as proven by the MK1 , which is still rocking and rolling after more then a decade.
3. If you have any remaining questions just pmail me directly (or via the contact form) and when i am back in later tonight i will attempt to answer your remaining questions as good as i can.
G
Beatstep & APC-40 Resolve Edition Custom Controllers https://posttools.tachyon-consulting.com
Test rig : Dual Xeon | UNRAID VM OSX10.13/14 | 48 vcore | GTX980ti/Vega 56 | 128GB | DRS 16.x
V: SDI > HDlink > Eizo + Scopebox
A: 5.1RME-FireFace