You are in the unenviable position of being stuck between underfunded and/or ignorant educators, and of product deprecations, and will necessarily be providing some feedback to those educators.
Adobe Flash will cease working in three months.
Switching to a different web browser might get you further into that remaining three months, or potentially switching schools if that’s feasible here. But in three months, Adobe indicates that Flash stops working.
The following is from Adobe, highlights mine:
https://www.adobe.com/products/flashplayer/end-of-life.html