Edit the ExceptionConfig file. It is just an XML file. If you reformat it so it is not all stored on one line you need to edit line 109. Otherwise serach for the section for Muse and edit the Argument that has the [INSTALLDIR] value.
[INSTALLDIR] needs to be enclosed in quotes. Edit that value key to look like this:
<Argument name="installerArg4="[INSTALLDIR]""/>
Then you can run the ExceptionDeployer.exe and it will install correctly.
If you are installing manually and setting the install directory be sure to enclose it in quotes or use the 8.3 filename path to install.