For those, like me, with non-Wacom devices (mostly N-trig based devices like Sony Vaio, Surface and others), there is a way to make the pen work on Windows 10: Just install Wintab drivers for Surface from Microsoft on the link below.
ATTENTION: After clicking the red “download” button, the only file you need to download is one of the two at the bottom of the list, named “Wintab_x32_184.108.40.206.zip” or “Wintab_x64_220.127.116.11”, just chose the one which matches your system (32 or 64 bits).
I tried this after I noticed that my Surface Pro 3 pen doesn’t work with Animation Paper. I now manage to draw a line for a few seconds and after that it doesn’t work anymore. Is there a reason for this?