What are the differences between the 32-bit and 64-bit installers of Flash Player?

Solution 1:

(I found this information as I was researching stuff to add to my question, so I answered this question myself.)

Starting from Flash Player version 11.3, there is now one 'universal installer' of Flash for Windows (combining the 32-bit and 64-bit versions) - one for the IE browser and another one for non-IE browsers. If you have the 64-bit version of Windows, the Flash 'universal installer' will install both the 32-bit and 64-bit versions of Flash.

(I.e. starting from Flash Player v11.3, the 32-bit and 64-bit installers for the same browser types are the same.)

Sources:

• Post by an Adobe Employee in this Adobe forums thread - Why does the site keep downloading the 32bit version of flash player when I'm running a 64bit system
• Flash player help page - You are having problems installing Flash Player on 64-bit Internet Explorer on Windows 7