I'm presuming you don't really need to edit in the pre-10.1 version go FCP; you simply need a version that can convert the old layout into libraries. That means you mean a computer that can run version 10.2.3 or earlier. 10.2.3 is the last version that can update these events and projects. You need a computer that can run OS X 10.10 Yosemite or earlier. A newer OS won't allow you to download the old version of FCP or run it. With 10.1 - 10.2.3 you will be able to download an old version of FCP from the App Store. That can be used to update the events and projects to the library format.