CTL Certificate trust list

Hi ....Im a newbie to this...but did develop composite RP printing some 20 years a go at Uni..OK i joined the merchant navy , so enough about that...OKwhen i try and download an STL file i get a little icon of a certificate and a box appears invalid use certificate trust list...what am i doing wrong?

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did you ever find out what you were doing wrong?? i'm having the same issue

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