Can I switch my method of Domain Control validation from Email to File, or vice versa?

You can switch your method of Domain Control validation from file-based to email-based for any SSL product that we provide. You can switch from email-based to file-based only for Comodo products.

Related posts:

I haven’t received my Domain Control Validation email (DCV) yet. What should I do? If I buy a Domain Validated (DV) SSL Certificate, which document(s) do I need to provide? My File Authentication file has been uploaded to the wrong directory. What should I do? I would like to change some information for my Domain Control Validation email (DCV)