Windows: 'Error 1706' Displays on the Computer While Scanning - missing Scan.msi.

I followed these instructions

When I get to the last step and double-click on it, it flashes but does not install.
(9. Within the Scan folder, double-click the Scan.msi file icon ().

What am I doing wrong?
I know you need Flash, which I installed yesterday.

It wanted Admin Permissions. Why it didn't ask earlier, I do not know.
**Remove this post unless it will help somebody.

Thank you.