"Not officially supported, as OMSA is mainly designed for hardware support, and technically a VM has no hardware. One of our other users on the site has been using OMSA on VM's for purposes like yours. Give it a try if your comfortable falling outside the "official" support arena. If 5.5 won't install you might try 5.4 or 5.3."
"it is not possible to install the OM client onto a VM guest"
"simply create a file "c:\nosystemcheck.txt" and start the MSI file ..."