If you downloaded the portable ZIP version of ExamWritePad, all the DLLs/EXEs are being blocked by the Windows SmartFilter.
You may need assistance from your IT team to do this, depending on policies and permissions etc.
Use Powershell and let it run through the EWP folder to unblock all files using the command below:
Replacing [EWP directory] with the folder path of where you are running EWP from.
dir -Path "[EWP directory]" -Recurse | Unblock-File