I heard that 4kids had a Pretty Cure dub on their website at some point. I'm not sure if it is the same Canadian dub or a redub from the 4kids dubbing company.
I know that 4kidz had the dubbing rights to the original Pretty Cure years before the Canadian dub was made. They never actually made the dub due to the failure of their dubs of Tokyo Mew Mew and Ojamajo Doremi. I don't know if their website had dubs made by other companies or not.
The dub this thread's about has never been officially released on home video or streaming platforms. However, it's also never been truly "lost." There were complete TV rips from the show's British and Canadian broadcast. You can find a version synched to the Japanese DVDs streaming on a number of anime piracy websites.