FSPViewer is available for download for different operating systems from this page.

Windows

Click here to download the program as an installer. The installer copies the executable file to the Programs folder and it creates a start menu entry. It also associates JPEG and TIFF images with FSPViewer, so you can open an image by right clicking it.
This is the recommended download for normal users.
If a previous version is already installed in the computer the installer will upgrade it.
The installer is digitally signed by Fulvio Senore.

Click here to download the program as a zip file. The archive contains the executable file: this option is reserved to users who have the technical skills needed to directly use these files.

Linux

Click here to download the program as a Debian package (a .deb file). It ought work on any recent distribution than handles Debian packages, for example Ubuntu and Mint. The package creates a main menu entry and it associates an icont with the program.

Click here to download an archive containing the executable and a set of icons that can be used to create a launcher. The executable is the same as in the debian package. This option can be used for distributions that do not support Debian packages.

OS X

Click here to download the OS X version. You will download a dmg file: just open it and look at the readme file.