"An "Autobuild" version is a version of CHDK that is still under development. As the developers compile new versions to test, their efforts are "automatically built" and made available on the web for beta testing."
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http://mighty-hoernsche.de/
I thought it would be easiert to download from one universal server, because nearly all cameras are at the autobuild server. Support and so one would be easier.
PS: only used big font, that developers dont "overread" it. Because PhyrePhox said it would be much easier to have the quellcode for the newest (current) version of CHDK, because 729 is "old".