@dh1
Just to be clear, there is the original AmigaOS 4.1 CD supplied by Hyperion. This was installed on some systems before AmigaOS 4.1 Update 1 became available.
AmigaOS 4.1 Update 1 is an ISO image that replaces the original AmigaOS 4.1 install.
AmigaOS 4.1 Update 1 must be installed before you can install Update 2.
Update 2, Update 3 and Update 4 are updates only, but must be installed in order.
Download AmigaOS 4.1 Update 1, unarchive and burn ISO image to CD-R.
Cold boot system from your new AmigaOS 4.1 Update 1 CD-R disk.
Quick format your OS4 partition and install AmigaOS 4.1 Update 1.
Remove CD-R disk.
Cold boot system.
Download AmigaOS 4.1 Update 2, unarchive file and install Update 2.
Cold boot system.
Download AmigaOS 4.1 Update 3, unarchive file and install Update 3.
Cold boot system.
Download AmigaOS 4.1 Update 4, unarchive file and install Update 4.
Cold boot system.
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redfox