How to allow users to install software locally
You want some of your users to be able to install software on your (Windows-) computers without upgrading them to domain admins.
Step 1 - Background
For every Windows system there is a group for “Local Administrators” which are able to install software locally. Unfortunately this is a local-only group and can not administered globally (within the domain).
Create a group (i.e. called “PC-Admins”) for you users which should have the same rights as the “local administrators” groups.
Add your users (i.e. teachers) to this group.
Create a group policy (GPO) to add the group “PC-Admins” to the “local administrators” group.
Further details can be found here.