Java - difference between "critical" and "software installer

I would like to push out the latest java updates to out workstations via ZCM patch management, however I am confused be the difference between the update packages available. The machines are windows 7 with ZCM v11.2.0 and already have a (slightly older) JRE installed on them. The ZPM java package labeled as impact type "critical" states the following in the notes:
"All web browsers are required to be shut down in order for Java JRE to be updated successfully"
The ZPM package labeled as impact type "software installer" has nearly identical installation notes, save for no web browser must be not running disclaimer like above.
Since 95% of our user base in the school district is most likely going to be using a web browser at any given time, I would give the success probability of the "critical" option as very low. Is it OK to use the "software installer" impact package? Is it truly not dependent on browsers being closed, or was that an oversight in the notes? What method do any of you use for reliable java updates?

I stopped using ZPM for Java and Flash installs. I actually right an AutoIT script that I deploy out to my laptops via bundle. It closes the browsers, uninstalls older versions of Java, and then installs the latest version I provide. What I found on some of our Java (browsers) based apps, specifically the gradebook and attendance programs, the ZPM deployment would install the latest with the older versions as well. This caused masive issues with after three updates those programs stop working.
I still have some deployment issues where a teacher will have java based failures or a failure to install the latest version correctly. But compaired to what was done before I have cut my failures in half if not more.
Nice thing is I can still view the Patch deployment in Patch Management as this deployment method is in process.
Richard

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