Example: There are two IxOS versions installed on the computer: C:\Program Files\Ixia\IxOS\6.10-EA-SP2 C:\Program Files\Ixia\IxOS\6.20-EA-SP1 Create the IXIA_MULTI_VERSIONS path variable and set it to: C:\Program Files\Ixia\IxOS\6.10-EA-SP2;C:\Program Files\Ixia\IxOS\6.20-EA-SP1