I have the same issue. I did download and install both Astro and FileBro
Can not get apk file's to install.
Either transfers from pc to tablet or Downloading direct to tablet will not install.
I have set "Applications" to Unknow sources.
Running an Sprint Branded HTC View 4G, on wi-fi, not on Sprint's Nextwork.
Android version 2.3.4
Any Comment, assistance or opinion?