Just click on the eye icon next to the download button:
You can pause it, watch it a 1/8x - 2x speed. view it from frame to frame, go to a specific time etc..
Its still really crappy, and full of bugs, but it should work you don`t input random stuff...
(1:1:111 should be fine..01:01:001 may could make some errors)
It the script stops working, just press "start again" or reload