Errors during updates can happen for various reasons. In most cases simply trying to download the update again and leaving the navigation device connected to the computer resolves the problem.
If you get an error during an update, try the following:
We highly recommend using a network (Ethernet) cable to make a direct connection between your computer and the Internet modem.
A wireless Internet connection can be used, but this can be affected by interference which can result in a slow or failed download.
Also, if you are using a public network, the network may have an unstable Internet connection which can cause a download or an installation failure.
If these steps fail, try installing the updates using a different computer.