TechCredo | How to fix download & installation unsuccessful Android Market issues: "Why the .android_secure folder might be to blame
Two common Android error messages that have managed to drive many increasingly frustrated users loco are “download unsuccessful” and “installation unsuccessful” when trying to download apps from the Market.
These Market issues are even worse than the familiar “phone storage is getting low” message, since there is no obvious way to solve the problem. The Market errors are especially common on phones running Android 2.2 Froyo or above, and for people who use the setInstallLocation 2 trick, or A2SD+ that lets all apps be installed to a partition on the SD card."
