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Some themes/fonts from here/from other site not been upload to Official Themes Store.. Since January 2014, Xiaomi been enforced Xioami Theme Policy (http://en.miui.com/thread-11723-1-1.html ), all themes/fonts need to be upload and get verified by them.. So, try consult the theme designer to upload their theme/font to Themes Store (http://designer.xiaomi.com)..
By the way, you should download and apply only themes/fonts that been publish on Themes app.