If there is an update to the software, there should be a prompt to update when launching FLOW. If there is an update but the prompt does not appear then it's likely the machine is not set to run as administrator.
Right-click on the FLOW icon on the desktop and select Properties at the bottom of the list
Select the Compatibilty tab on the properties window
Select Change settings for all users
Place a check next to Run this program as an administrator and click OK on all windows
Open FLOW and there should be a prompt to update the software if an update is available.