Please allow me to quote the release notes regarding PPC support: 
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Important notice regarding PowerPC™ support: Our last PowerPC™ machine quit service, so we are no longer able to test new releases for compatibility with PowerPC™ machines ourselves. Since we got zero feedback when searching for beta testers via the Remote Buddy forum and Twitter, we estimate interest in PowerPC™ support to be very low, maybe even completely absent by now. So, starting with this release, we're dropping support for PowerPC™ Macs. The - as of now - last release of Remote Buddy with support for PowerPC™ CPUs can be downloaded from the Remote Buddy FAQ.

If you happen to still use a PowerPC™-based Mac® and you'd like to help out with beta testing, please get in touch. If there's enough interest and we can gather a critical mass of beta testers, PowerPC™ support may return in the next release. 
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You can get the previous release - which still has PowerPC support - at: 
http://www.iospirit.com/support/faqs/remotebuddy/category/6/General/entry/245/a/

Best regards, 
Felix Schwarz