@Fedor T ,
I try to refer to the referenced document and Microsoft official page to download the recent versions of the MS Edge browser.
The referenced document shows the steps to downgrade the MS Edge browser to the recent previous versions.
At present, the current stable version is 87.xx. We can see that your requirement is to downgrade to the MS Edge version (80.0.361.111).
We can notice the major difference between the stable version and the version you want to downgrade to.
If we see the Microsoft official page to download the MS Edge browser then at present following versions are available to download.
So based on this information, it looks like at present we can only downgrade till the MS Edge 84.x version and I did not get any official way to downgrade to the MS Edge 80.x version.
Thanks for your understanding.
If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.