If you already have Softimage 2015, you must uninstall it first before you can install 2015 SP1.
Installing Softimage 2015 SP1
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eX-SI
ICE, scripting, and other tech stuff about Softimage aka XSI
If you already have Softimage 2015, you must uninstall it first before you can install 2015 SP1.
eX-SI 