G5 desktop running 10.5.1 keep   getting a message to  update but will not install downloaded update

this power mac will not update from a downloaded software just hangs at about 10 per cent

Backup your data at least twice to two separate media:
https://discussions.apple.com/docs/DOC-1992
Shut down and remove that media.
Download and install 10.5.8 combo from here:
http://support.apple.com/downloads/Mac_OS_X_10_5_8_Combo_Update
Repair permissions from Applications -> Utilities -> Disk Utility -> First Aid, and selecting the hard drive.
You should now be able to use Software Update for any updates that work with 10.5.8 PowerPC.  Any that only work with Intel macs, you'll need a newer Mac.

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