1 - Windows Seti@Home apps The current Berkeley stock application versions are 7.0x for multibeam and 7.0x for astropulse. The current lunatics.kwsn.net CPU multibeam code revision is Alex Kan's v8.0, revision c.
The v0.43 installers are hosted here initially, but are
Seti@Home & BOINC modified source code You can always find the most recent versions of optimized source tarballs here - they are based on Eric Korpela's archives, which you can find in the Links section.
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3 - OSX Seti@Home apps Only Intel-CPU apps are supported @ Lunatics. For PPC, please check Seti Main forum sticky threads for latest apps by Alex Kan or Dotsch.