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The 32-bit version (afstokens.zip) is for Intel Core Duos, and the 64-bit version (afstokens-64bit.zip) is for Intel Core-2 Duos (you can determine which you have by looking at the "Processor" line in the "About this mac" window under the Apple menu
Mac OS 10.7 (Lion)
- Install the Lion specific Kerberos preferences file to /private/etc/krb5.conf (the Snow Leopard file will not work)
- Download OpenAFS 1.6.x installed from the Openafs.org website
- Follow the instructions beginning at step 3 in the Snow Leopard instructions