You are downloading the Real Microphone XAP file v220.127.116.11 for Windows Phone. Real Microphone is a free Productivity App: Use your Smartphone as a replacement for a real microphone. Just connect your amplifier (or earphone) with the audio connection jack and start to speak. Switch. You can now download the offline XAP package file to install & try it.
Download Locations for Real Microphone 18.104.22.168 XAP file
To try to install it manually from an SD card, you should choose one of the server location above to get the offline Real Microphone XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.