Google play download unsuccessful error

[Dingo]

I put it here because happened to me two times allready.

copy/paste
Android Market: “Download unsuccessful” Error Fix
by MITCH
in ANDROID, SMARTPHONE
I recently started getting Download unsuccessful errors on my Motorola Droid whenever I tried to upgrade or download an app. This seems to be a common error for the entire line of Android devices. Luckily, the fix was easy for me. Give these steps a try.

1. Open Settings.

2. Select Applications.

3. Select Manage Applications.

4. Select Market (You may have to press Menu > Filter > All to see it)

5. Select Clear cache.

6. Back out of the screen and select Download Manager.

7. Select Clear data.

8. Also clear data for Google Apps, Google Talk, and Checkin Service. Some users are reporting they had to clear data for the Browser app as well.

See if downloading from the Android Market works now.

[Dingo]

well, won't work in my case

so titanium backup is option