Welcome to the download page of SPEX. SPEX is available for Linux 64-bit and Mac OSX >=10.10. Please find the stable version here:
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SPEX is only available natively for Linux and Mac OSX. However, with recent processor technology it has become much easier to run Linux within Windows on a so-called virtual machine. SPEX can also be installed in the virtual Linux environment, although it is most likely slower compared to a native Linux installation.