All updates to the QuickBooks applications on our system are done by our engineers on staff after hours. You are not able to run the updates yourself - if you try it will error out midway through.
If you ever receive a prompt to install an update, just click Update Later. Once an update is released our engineers beginning rotating servers out for updating in the evenings so that you are not effected and can continue working without interruption. Sometimes this process can take several days to complete.