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Murray BrownFlag for United Kingdom of Great Britain and Northern Ireland

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VB.net Excel Add-in not installing Certificate not trusted

Hi

I installed an Excel Add-in that I built in VB.net several times on the same machine. The installation suddenly didn't work.
It just froze. So I uninstalled a few Windows Updates and then it installed just fine.

I then tried to install a later version today and it wouldn't. The error message said that the certificate is not trusted.
How could this be? This is very frustrating. How do I get around this?

I tried running as administrator to no avail. Is Windows Updates part of the problem?
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Hi
Thanks. This same addin has installed well on over 50 other computers. Why do I need  a root certificate authority?
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SOLUTION
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View this solution by signing up for a free trial.
Members can start a 7-Day free trial and enjoy unlimited access to the platform.
Thanks very much