Installation files are not retained even though "Do not remove the installer files from the managed device after installation" is specified.
It is likely that the files are outside of the external installer's third-party folder.
The option "Do not remove the installer files from the managed device after installation" refers to specifically to the external installer's third-party folder. Any files outside of this folder are not saved automatically.
There are two options to resolve the issue:
1) Put CopyFile.vbs in the root of the package and explicitly include it as a File entry in the package installing into the "Install Folder"
2) Leave it where it is, but specify the path where it can be found eg $(CacheDirectory)\Common\SmartView\CopyFile.vbs
If this does not solve the issue, ask the customer to provide for a full copy of the package so that we can test on our side.