I've had exactly the same problem on other PCs too.
The offline installer worked OK on the first PC.
I use Firefox, so used the "other browsers" installer. Do I also need to install the IE installer in case I use IE in the future?
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If you are planning to use Internet Explorer, then you may also want to install the IE version of Flash Player.
Thanks for your help.
It's annoying that on the 3 PCs I've updated so far, I've been unable to update using the normal update procedure.