Version 7.21-4715 Beta has just been released. This version also extends the maximum remote connections limit to 300.
Note that connecting such amount of computers will require a respective HWiNFO64 Pro license.
It needs to be installed on each machine and configured to disable/hide all non-necessary sensors to limit the amount of data transmitted. This could be automated to some degree, but it depends if the remote systems have same hardware configuration.
The license on the central system needs to cover all machines connected.
You can test this also with the non-Pro version which allows up-to 5 connections.