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wcan't update. Download finishes and then window informs disk is corrupted and so update unsuccessful. I have warning that existing system is no longer protected and am getting lots of dodgy emails. Need to update asap.

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Have attempted to INSTALL / update to 3.6 and to 4.

Both unsuccessful. 

Download occur and complete but then message stating "corrupt disk" and so installation can not progress.

I am using i mac OSX 10 .3.9 on G4.

Have tried using Monzilla site and also by clicking on messge. Same correption message

Have attempted to INSTALL / update to 3.6 and to 4. Both unsuccessful. Download occur and complete but then message stating "corrupt disk" and so installation can not progress. I am using i mac OSX 10 .3.9 on G4. Have tried using Monzilla site and also by clicking on messge. Same correption message

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Firefox 2.0.0.20 is the last ever release for Mac OSX 10.3.9 and earlier versions. Newer versions of Firefox aren't compatible.