An increase in the strength of the key used to sign software packages in V8.5.0 of the 
Spectrum Virtualize software means that it is not possible to produce a single Software Upgrade
Test Utility package that can be installed on all software versions.  Therefore you will find two 
different versions of the Upgrade Test Utility included in this download.  The two files have 
identical functionality, but are signed with a different GPG signing key.

The choice of which file to use depends on the current level of software installed on your device.   

* Systems that are currently running V8.5 or higher should use the file named IBM_INSTALL_FROM_8.5_AND_LATER_upgradetest_XX.X

* Systems that are currently running V8.4 or earlier should use the file named IBM_INSTALL_FROM_8.4_AND_EARLIER_upgradetest_XX.X

If the wrong file is selected, it will fail to install.