How do you get to the assumption that many have the problem?
I am not aware of any problem of this kind. So far I have not read or heard such a problem request .
We use the Sim Acars on at least 100 different PCs from Windows 7 to 10. Nobody has such a problem.
Therefore I would rather see your system as the cause of the problem. Pls try an older version of FSUIPC and give me a feedback.
I suspect rather that a Framenetwork error in connection with the last update from Windows 10 causes your error.
First of all:
Please start the Aracs with admin rights in any case.
Install FSUIPC also with admin rights. Check that the intall Path is the right one.
You seem to have several simulators installed on your PC, this can quickly lead to problems.
I once uploaded you a version of Acars, please try it.
https://mega.nz/#!xsg3HCiI!NjrhvmFz9gEzT2NjQmirTugUxIv9j73_3um-3u_ORNESophie