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The More Info screen is actually where the needed manual override option is placed. Click the "Run anyway" button.
Let 'er rip!
Now the Welcome screen of the installation wizard should appear. Click the "Next" button to proceed.
Automatic or manual?
Are you going to be using Cassandra frequently? If so, have the services run automatically. But if not, then uncheck the two options shown here. This way, everything will be installed, but it won't run unless you explicitly start it up. Once you've made your decision, click the "Next" button.