INSTALL_ERROR_DISTRIBUTION_SIGNED_BY_APPLE, INSTALL_ERROR_DISTRIBUTION_SIGNED_BY_APPLE, INSTALL_ERROR_DISTRIBUTION_SIGNED_BY_APPLE

This worked great!

So here is the path: Open the application "Keychain Access"

Then go to the menu "Keychain Access" select "Prefrences"

Click on the button "Certificates"

Select the drop down box "Online Certificate Status Protocol (OCSP)" change to "Best Attempt"

Select the drop down box "Certificate Revocation List (CRL" change to "Best Attempt"

Chris M.

Thank you, Chris. Until I found your post, I couldn't update any of the programs I'd purchased.

Wow! You are a master it help me too!!!!

perfect worked, ended a nightmare