You need an SVN client to use the SSI Altium repository. I know you're running Windows since you have Altium, so go install [http://tortoisesvn.net/ Tortoise SVN].
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[https://tortoisesvn.net/docs/release/TortoiseSVN_en/tsvn-quick-start.html Here] is a resource for some basic info regarding SVN and setup
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Make sure you install the Windows context menu support.
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Set up Tortoise:
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- Make a directory to store all of the SSI data
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- Right click and select "SVN checkout"
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- Point to the repository at: http://subversion.assembla.com/svn/stanfordspaceinitiative
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- Enter your credentials
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When you are using the SVN, the most important commands are update, commit, lock, unlock, and add.