Windows 8.1 . That means:
: Choose your installation folder (the default C:\Program Files\7-Zip is usually best) and click Install . The process typically takes only a few seconds. Key Features for Windows 8.1 Users Download - 7-Zip 7 zip download windows 8.1
: Required only if you are running the 32-bit version of Windows 8.1. Key Features High Compression : Offers a high compression ratio in the format using LZMA and LZMA2 algorithms. Format Support : Unpacks a wide variety of formats, including RAR, ISO, CAB, and MSI Free and Open Source Windows 8