So next time ask the customer if they are using the exact url to access the site. I told you we were moving hosting and that never occurred to you.
So not everyone is inept - I knew I was uploading the files correctly.
[Zen Cart] magic_seo_url.php file is corrupted
Re: [Zen Cart] magic_seo_url.php file is corrupted
Error message you were getting is not related to URL where Magic SEO URL is installed. You will get it on any location if file is corrupted - no matter for what URL your copy has been purchased.