How can I install the Flash Debug Player in Internet Explorer 10?

I just downloaded the Flash Debug Player 11.4.402.287 from http://download.macromedia.com/pub/flashplayer/updaters/11/flashplayer_11_ax_debug.exe - however, trying to install it merely shows a message box saying

The installation encountered errors: Your Microsoft Internet Explorer browser includes the latest version of the Adobe Flash Player built-in. Windows Update will inform you when new versions of the Flash Player are available.

I'm using Internet Explorer 10.0.9200.16384 on Windows 8. A bit of Google research suggested that IE10 has a Flash player built-in (similiar to what Google Chrome has) so I looked for a way to disable the player. It seems that this is indeed possible by clicking the Cogwheel icon in the IE10 toolbar and then selecting 'Manage Add-ons'. The dialog which shows up shows a 'Shockwave Flash Object' entry. However, even with the built-in Flash player disabled, the Flash Debug Player installer keeps giving the same message.

Does anybody knwo how I can install the Flash Debug Player in IE10?