I download the update, but my phone wont install it. It says "there is another program with the same name and different signature installed". Anyone else with this problem and what can I do?

Is it an App you trying to update or your phones firmware?

If it's an App, I would try uninstalling it. Then reinstalling it from Google Play, sometimes the update may require you to uninstall the previous version in order to update properly.

Wait till you get the official update.