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Windows v15 sp4 install - "disk1.cab has invalid digital signature"

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3CXusername

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Windows Server 2008 R2 x64. All Windows updates applied.
  • Tried KB3004394 as well as enabling "Allow software to run or install even if the signature is invalid".
  • Tried downloading multiple 3CX sp4 installers all same outcome.

Attempting upgrade from v14 sp3 to v15 sp4. Uninstalled v14 components and on v15 install getting this:

upload_2017-2-8_12-25-19.png

Any ideas?

thanks in advance
 
Last edited:
Chances are, you have turned OFF Automatic Root Certificate Update. For example, if you use DigiCert certificates , as I do, you may have turned it off on the Tools tab. Re-enable the Automatic Root Certificate Update policy, and you will be able to install 3CX server.
 
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