Hi brianorbea,
Unfortunately there’s not way to get a previous binary version through Launcher. If school doesn’t update to 4.8.2, you can grab source version of 4.8.1 from GitHub at home and build that. Here’s link to that (note you must have set up your GitHub account with Epic to see it):
If you haven’t built from source before, here’s some information on how to do that:
Note that it’s worth school to upgrade to 4.8.2, which fixes some crashes in 4.8.1. Hope that helps!