I (and some other developers) work at the very skinny end of a long internet
connection. I'm a full-time cruiser and work from my floating home. My last mile is always Wifi, and sometimes nothing at all.
At this very moment, the Wifi connection I am (legally) using precludes FTP uploads. That's their policy, and its not unusual.
Our other two Windows builders are away from the net at the moment as well.
So, no 30 MB uploads are possible at the moment. Mac and Windows versions are ready, but have no way to upload.
The only alternative to the present discomfort would be to hold back the 3.1.919 Beta until all three platforms are uploaded and ready, whenever that may be. Of course, that makes no sense at all.
So, we do the best we can do with the volunteer resources at hand.
Of course, wired Windows developers interested in becoming Release builders are always welcome to the team. Or a sufficient donation stream to enable a high bandwidth cellular connection would also help the situation.
I am sorry for the deferred Windows Release. I really want to get the Beta feedback from the 85% of OpenCPN user base on Windows. Really.