I received an e-mail from support@hantek.com saying that issue was solved.
Indeed, I could log-in to eediscuss over https, and was able to post my question over-there.
Still, I don't fill confident, as I can't reach hantek.com primary web-site using https. Firmware updates downloaded
over common http, w/o md5 or any other means to verify integrity of the software package makes me suspicious. I see significant performance degradation after last update FW, and can't roll back to old version.