I’ve been there, but didn’t get a T-shirt. Offline installs are a not uncommon use case. SNAP uses Netbeans, which has offline update capabilities. For your lab, you could mirror the updatecenter folders onto a portable drive at home. In workshops for students from developing countries we learned that students had problems installing and maintaining the software at their home labs, so the workshops began to emphasize self-reliance in installing and maintaining the software. Having students install updates manually from your lab’s server might be a useful part of the learning experience, but you may be surprised by the issues that crop up.