Currently, install kits such as those of PI DataLink, PI AF Client, PI API, PI SDK, PI OLEDB Provider, PI OLEDB Enterprise, and PI SQL Client always install both the 32-bit and 64-bit versions. Most of the time, one of these versions is unused and is simply wasting disk space, cluttering the list of installed programs, and making the user wonder why they have 2 versions of the same program. Uninstalling the unused versions is only a temporary fix since any upgrade to the programs will cause both versions to be installed again. In future install kits, please allow the user to choose the versions of the program that they want to install. By default, select the version based on the bitness of the operating system, or, in the case of PI DataLink, based on the bitness of Microsoft Office. If this default is not feasible, then select all versions by default.
I realize that PI API, PI SDK, PI OLEDB Provider, and PI OLEDB Enterprise are all somewhat deprecated.
At this point, it might be better to just retire the 32-bit version of programs that also have a 64-bit version.
Alternatively, install kits could be restricted to 1 bitness, so we would have 32-bit-only install kits and 64-bit-only install kits. This way, we can get the ideal case (all 64-bit) sooner.