. . . and have my students open it in their Student versions of ExtendSim?
No, but there is a work-around.
The Student version of ExtendSim can open models built in or shipped with ExtendSim Student or in an activated Model Developer Edition of the software, but cannot open models built and saved in a Trial version.
So, if you build a model in a Trial version of ExtendSim, purchase and activate that license, then re-save the model in the activated license so it can be opened in a Student version.
If your university is an ExtendSim Adopter or owns a Floating license of ExtendSim and you are attending class remotely, follow the instructions in Remote Installation of ExtendSim on a Client Device for a Floating License. This document instructs you on how to install ExtendSim on your device and access the ExtendSim license owned by your university.
Follow the detailed instructions in Installing & Activating - Floating Licenses to install ExtendSim on Client devices.