I start at https://www.sweethome3d.com/download.jsp
Download the JNLP
Open Web Start begins
The Sweet Home 3D logo / eTeks shows up.
I get this error box: https://ibb.co/f9ND5vn
Then this "untrusted certificate" box: https://ibb.co/Dw1b1r2

Here's the cert. The "copy to clipboard" button does not work
https://ibb.co/hMWnfgZ

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It may be that OpenWebStart does not have the proper root certificate?
Do I need to download something from https://www.certum.eu/en/cert_expertise ... tificates/