Sometimes when I update an app through Market the download gets stuck at 0% or 100% and won't finish download or finish installing. The only way I've found to work around this is to uninstall the app, then reinstall from Market. Is there a better way to fix this situation?
On the "downloads" screen, long press the app in question and click "Cancel download." Then try to update the app again and see if it'll complete this time.
If you have a lot of downloads stalled change the connection type between 2G and 3G/4G within
Settings > Wireless & networks > Mobile networks > Use only 2G networks > Klick the checkbox
or turn Wifi off and on again. Also this keeps your stalled downloads in queue.
Also logging out and back into GoogleTalk has proven a successful solution to this issue sometimes.