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I have used IE, EDGE, and Chrome with no issues. Unless it is a country based server issue (I'm in the US), then maybe it's your browser and you might try a different one.
It should not matter if i use Mozzila or something else, the problem is the host. If other web browsers accept unsecure hosts it's there problem. I'm from The Netherlands, thats not the problem iether.
It has be fixed and downloaded what i needed.
"When Firefox connects to a secure website (the URL begins with "https://"), it must verify that the certificate presented by the website is valid and that the encryption is strong enough to adequately protect your privacy. If the certificate cannot be validated or if the encryption is not strong enough, Firefox will stop the connection to the website and instead show an error."
Aside from the root cause of this issue, you could also temporarily add an exception to ignore this message for this particular session and then move forward with your download , if having your download immediately is critical.