Reverted all the DLLs' "Platform Target" project settings to "Any CPU." The problem with putting them to "x86" is that a host application built to "Any CPU" or "x64" fails to load the DLL. So the EXEs will remain "x86"; only the DLLs are reverted to "Any CPU". This should fix Issue #20199.
REMINDER: the 5.x release includes breaking changes
from 4.x. See Migrating from v4 to v5
for more information.