Software Deployment

Anyone familiar with Vanguard Systems IMS/21 client install (version 7.3.0)? Trying to install on devices with the latest version of Windows 10.

I can install quietly and successfully via SCCM, using the command line:

SETUP.EXE /s /f1".\IMS21_response.iss"

Install finishes successfully according to Software Center, as well as Programs and Features on the target device. But near the end of the install,  a DOS window opens and then stays open for at least an hour, maybe longer. Messages in the DOS window are similar to the following:

Microsoft (R) CLR Native Image Generator - Version 4.8.4320.0
Copyright (c) Microsoft Corporation.  All rights reserved.
Failed to load dependency stdole of assembly Microsoft.VisualBasic.Compatibility, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a because of the following error : The system cannot find the file specified. (Exception from HRESULT: 0x80070002)
Failed to load dependency Leadtools.Multimedia of assembly Leadtools.Annotations, Version=17.5.4.0, Culture=neutral, PublicKeyToken=9cf889f53ea9b907 because of the following error : The system cannot find the file specified. (Exception from HRESULT: 0x80070002)
2>    Compiling assembly Accessibility, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a (CLR v4.0.30319) ...
1>    Compiling assembly System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 (CLR v4.0.30319) ...
2>Error compiling Accessibility, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a: Windows cannot verify the digital signature for this file. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source. (Exception from HRESULT: 0x80070241)
2>Ngen failed to generate native code for image Accessibility, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a because of the following error: Windows cannot verify the digital signature for this file. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source. (Exception from HRESULT: 0x80070241)
2>Ngen will retry compilation of image Accessibility, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a