At first please check if you have the following Windows Update installed on the PC:
This update is mandatory for the installation of the RapidAuthor product.
Installing RapidAuthor product without Internet access may lead to the following notice “A file that is required cannot be installed because the cabinet file … has an invalid digital signature. This may indicate that the cabinet file is corrupt”.
Please make the following actions to install certificate from the following package:
- Double-Click on certificate from the package
- Install Certificate in Certificate dialog
- Next in Certificate Import Wizard dialog
- In Certificate Import Wizard dialog select Place all certificates in the following store and Browse
- Select Trusted Root Certificate Authorities
- Ok, Next and Finish.