I have no issues accessing the BandLab website, but at work it complains about the SSL certificates not being valid.
It does let me in when I add the certificate as an exception though.
My corporate laptop is still running 1709 rather than the latest 1804, so I put it down to out of date root authority certificates.
Are you running the latest version of Win 10? If not, maybe some of your root authority certificates are old and maybe your AV is blocking the site as a result?
M.