It seems Windows Phone users are unable to download apps for the time being. The Windows Phone Store is having technical issues, which is preventing the download of new apps.
(http://cdn.gsmarena.com/vv/newsimg/13/02/wp-store-issue/gsmarena_001.jpg)
Users trying to download or update apps are being shown the above error message, with the error code: 805a0193. The issue seems to be widespread and we have confirmed it on our own device as well.
No word yet on what's causing the issue but hopefully it should be sorted soon.
Source (http://www.engadget.com/2013/02/09/windows-phone-users-unable-to-download-apps-receiving-error-cod/)
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