This is an old thread, but I also had this problem on Window 10 so if anyone else has this issue it worked after re-building the ANT Wrapped DLL.
Here are the steps I took:
Download the ANT SDK for PC (requires account upgrade to Adopter):
https://www.thisisant.com/resources/ant-windows-library-package-with-source-code/
Open the visual studio project at:
ANT-SDK_PC.3.5\ANT_Unmanaged_Wrapper\ANT_Unmanaged_Wrapper.vcxproj
Build the ANT_Unmanaged_Wrapper project in the solution explorer. I retargeted both ANT_Unmanaged_wrapper and ANT_LIB from 2013 to 2019 built tools and it was successful.
Moved the newly built dll from ANT-SDK_PC.3.5\Debug\ANT_WrappedLib.dll to your Mesh Tester folder and the problem was solved.