The LG SP USB driver is required in order to transfer, flash, and manage content from and to your phone. The USB driver requires installation. After its installation, the LG phone is available for browsing in My Computer/Computer. If you deny, or remove its installation, then any of the mentioned procedures won't be available. I recommend keeping it installed on your computer. However, if it takes a very long time to update, you can simply close the process and then open it again. It should continue from where it was left off.