That is a strange requirement.
Years ago, Microsoft stopped supporting their own Internet Explorer app, and introduced Microsoft Edge, but this app was written & maintained by Microsoft.
Microsoft tried to keep updating Edge, adding features, reacting to the newly-released Google Chrome, but Microsoft eventually realized that keeping-up was difficult, and a drain on their programming department.
Google Chrome has always been based on the open-source "Chromium" project.
So, what Microsoft did was to copy Google, by discarding their own programming-code for Edge, and doing the same -- creating a "new Edge", also based on Chromium.
If you "peel off the covers", you will find that Chrome & Edge are the same web-browser, with a slightly different user interface, and should be identical when processing a complex web-site.
Thus, that requirement to NOT use the "old Edge", and instead use Chrome, was valid, a few years ago, but I think that the requirement needs to be evaluated, and either withdrawn or be updated.
So, I think that if you use the "new Edge", instead of Chrome, you will have no problems. Give it a try.
P.S. If you have some technical skills, try:
- buy a new disk-drive
- use free software, such as AOMEI, to "clone" your current disk-drive onto the new disk-drive
- remove the current disk-drive from your computer
- connect the new disk-drive
- boot from the new disk-drive
- exit from "S-mode"
- install Firefox or Chrome
- run the required "test" software
- at the end of your course, "reverse" the process, reinstalling the previous disk-drive, which will still be in "S-mode"
- keep the new disk-drive as a "backup" of your files/folders