PP420 V 3.6 runtime

It would be good to have the old versions available as well.
We have a lot of plants in operation with old Automation Studio versions like AS 2.7 which are not easily upradeable, same with AS 3.x Projects with Safe Designer projects.
We even have at least one plant I am aware of running with the B&R Multicontrol (ok, I would not expect to find downloads for Prosys, but at least for all Windows related software).

I noticed a couple weeks aga that the upgrade downloads in AS 2.7 are not working anymore, which makes it pretty complicated to install the AS on a new virtual machine and get it ready for an old AS project.
Why got many downloads removed which were available before?