I very much doubt that the so-called Chronovisor actually exists.
The Elohim keep track of everything that happens on Earth, so they can indeed view any event from any time period whenever they want, since they have records of everything and everyone.
But I highly doubt that they would allow anyone on Earth to connect to the Elohim's "cloud computer" and wirelessly receive images from there from other time periods.
The Chronovisor was supposedly built during the decade of the 1960s when we still did not have the Internet or wireless cloud storage ourselves, so the whole Chronovisor story makes no sense.
When the Elohim return to Earth, I'm sure they will let us view what happened in the past, but for the time being it is not possible.
On occasion, a person with highly developed telepathic abilities might be able to connect with someone living on the Planet of the Eternals and receive information, but it is very rare, and it would be done telepathically and not with a machine.