Luis,

The zip you are referring to is the "full" distribution package. It contains both an installer (Setup.exe) which contains all the necessary installation files, and also contains the "Win32" directory you refer to. This Win32 directory contains all the necessary files if, instead of using the installer, you wish to manually install SpamFilter simply by copying the contents of that directory to any location on your filesystem. Unlike most other Window applications, we made SpamFilter as "clean" as possible, so that all the files we use are stored in a single directory structure, without the need to "register" DLLs, nor making any registry changes (except for the antivirus plugin - this latter does have a registry key it uses).

In addition, we usually make available "binaries only" updates. As 99.9% of our updates simply require updating the SpamFilter.exe and SpamFilterSvc.exe files, these zips only contain the updated executables. Sometimes (v4.1.2.805 is an example) we also include some DLL files that are either extra or ned to be updated. With these "binaries only" you simply have to stop SpamFilter, extract the contents of the zip in SpamFilter's directory, replacing the existing files, and restart SpamFilter. A reboot has never, in the past 7 years, been necessary...   

Luis,

You may find the "executable only" by logging into the registered user area on our website, and look, towards the bottom of the page, for the section "Binaries, pre-release and/or previous builds". Please note that your software maintenance needs to be up-to-date for those options to be available.

For the suggestion about labeling the new options, here's the issue :-)
SpamFilter will automatically add the new available options in the SpamFilter.ini file as soon as the "Save Settings" button is clicked at least once (it will run with the built-in default values in memory - upon clicking the "Save Settings", these will be written to the ini file). When these new options are added, they *should* be added at the end of the section they belong to, wich in 99% of the cases is the [server settings]. So we "almost" have the functionality you suggest out-of-the-box, as they are relatively easy to spot. We are missing the comments in the ini file though, but to obtain that we'd have to disable the above automatic functionality and instead having to start adding values and comments programmatically to the .ini file... which is a bit of a headache!
We do however always maintain the release notes for every single build of SpamFilter that is released to try making up for this...

Please contact us by email if you are still not seeing the binaries only builds. We did have an issue with the website last week dealing with a very similar issue, but thought it had been solved.