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Not sure about mac OS, but on windows all Sony installers are basically zip archives.
If you rename exe to .zip, you can unpack it. Then there is file (dont remember exact name, something like prsver.dat) in some of the subfolders, that contains installers version. You can edit it with notepad or any other text editor. Set value to something higher than what you have on your reader, it should do the trick.
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