Are you using Microsoft explorer?  You have to use that.

Also, I had exactly what you have happen, then I noticed that the certificate message was popped up behind my program screen (kinda hidden).  If you minimize the program, you may find it.  Then follow the instructions exactly, where you click […]

Resolution for 'certificate message issue: 'exporting to desktop' available: Yes.

The certificate message issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the certificate message issue yourself by looking for a resolution described in the article. If it is a complex certificate message issue or you are unable to solve the issue, you may contact us by clicking here or by using other certificate message support options.

For more information about resolving issues related to certificate message in Quickbooks/QBO or to get support for the issue 'exporting to desktop', click the link below: