2020 Design 11.9 and higher
When you launch 2020 Design and attempt to Sign In, the following error message may appear:
This error indicates a problem with the certificate on your operating system. Follow the steps below to download and install a new certificate:
1. Open Internet Explorer.
2. Copy and paste the following URL:
3. The following message will appear:
4. Open 2020 Design.
You can also try clearing the cache using this app, click HERE to download it.