It may work .. but again, there may be slight library changes that preclude Win 7 .. especially if they dove deep into the GPU integration to make the frequency band splitting work.VDJ is stating on their download page, that 2021 is for Windows 10 64 bit machines.
A head scratcher for me as I have a Win 7 Pro 64 bit machine with an SSD, 24gd ram, and an 8 core running at 4.0ghz native which runs stronger than my Win 10 Pro ASUS 64 bit gaming laptop (I-7 at 2.8ghz, 16gb ram, SSD)