First off let me say thanks to those that worked on this script and also special thanks to @danialbulloch for assisting me today.
My issue was the file 7z.exe I mistakenly used the downloaded installer and not the 7z.exe that is in place after the installation. If you do it this way you may get an exit code "Command results: WARNING: Unknown exit code. (Code: 0x)".... this also shows nicely in the email alert.
Testing with the corrections so that I can be another confirmed installation success. Update to follow.