Acer just released a new app that is designed to help users download the new Ice Cream Sandwich update to their Iconia A500 or A510 Tab. Although several users have been able to successfully get the update, the app claims that it is necessary to make the process run more smoothly. Here's the app description and a source link to the Google Play Store:
PLEASE READ! Major release updates ONLY for A500/A501.
This application software is required for the ICS upgrade. Please download.
Acer continues to offer updates to enrich your Iconia Tab A500/A501 user experience. These include firmware updates and application refreshes. In order to get the best out of your Iconia Tab, its installed applications, and prevent system incompatibility, you must apply all application updates before upgrading the firmware.
Download firmware updates and application refreshes for the Acer Iconia Tab A500/A501 to get the best out of your Iconia Tab and its installed applications.
If you encountered any problem when upgrading, please download the file from our official web site.
Source: AcerTabletForum via Google Play Store - Acer Iconia A500/501 ICS Update App