In the meantime, users are advised to seek alternative end-to-end encrypted channels.
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The official advice from security researchers is to disable and/or uninstall the affected software until the vulnerabilities are disclosed and fixes can be issued. How about just hold off on encrypting things for a bit. Well, great, when they come up with an updated app, it'll be harder to get it installed.
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This article seems akin to "Researchers have discovered that seatbelts don't always work - here's how to cut them out of your car" (the dealer will really appreciate that when you take it in for repair).
If you don't see the mailbundle file, return to the previous step but type ~/Library/Mail/Bundles in the Go to Folder dialog (note the tilde (~) character denotes your home folder).