Capitalise your entire URL / link. Is the site still accessible? If so, it won't matter a jot then to Google or SEO but note Google and SEO are case-sensitive and you are probllby on a Linux (Apache) server.
It is one way to find out if your server is Windows (doesn't matter) or Linux (does matter).
I would bite the bullet and go for lowercase, as enforced by Xara. Adding redirects or server-side fixes are prone to break.
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