There's no conversion from 7 to 11. As you noticed, no conversion dialog is presented; that's because it's not needed. Version 11 can read and work with any file created with any version between 7 and 11.
(Note: There are a few functions that were changed / renamed, and a few new ones, introduced along the way. So, while you can easily go up in version number, you may see a malfunction or two if you try to go down in version. Check the release notes on each version to double-check your function usage to make sure you don't have a problem.)
Thank you for your response and confirmation. I appreciate your note about the malfunction.