Found a bug in it in May, and it worked after that was fixed. (guide for the software setup: http://blog.tomfifield.net/2018/05/how-to-use-nhi-online-service-with.html?m=1 )
Can’t confirm right now, since the card reader is elsewhere, but a 404 does not look good. Maybe give Information For Foreigners a call? They were helpful last time for me.
Might do later, it’s a 24 hour line right?
I successfully downloaded my entry and exit dates about a week ago, so this bug must be new.
24hr, but if you call during business hours, sometimes they can transfer you to relevant departments.