I have run the VMware Standalone Converter now from several different machines. Each time I get an error that the file

C:\ProgramData\VMware\VMware vCenter Converter Standalone\ssl\rui.crt cannot be opened.

The file is always there but cannot be accessed. The file properties always show Administrators have full access, and my current user is an administrator. Never the less, just set your logged in user to have full access to the folder and all will work fine.