It appears the installer is missing files or references to files that were included in previous versions of ScanSoftPOS. The References progress bar also no longer animates to 100%
This renders the Installer to be used as an updater only. Clean installs will be missing files.
I have compiled a list of references missing below as well as a screenshot of the installer and logs
Copying missing files from older versions clears any errors in the application but that still renders the installer as an updater tool instead of a proper installer.
SOLUTION
Files weren't correctly being added to site which made installer attempt to reference files not present. Systematically adding files moving forward for new update will avoid this issue.