You are downloading the 8 Zip APPX file v18.104.22.168 for Windows Phone. 8 Zip is a paid and useful Productivity app: 8 Zip is a powerful file archiver for Windows Phone 8.1 Possibilities: Create archive file (ZIP, 7z, TAR, GZIP, BZIP2, XZ) Open ... You can now download the offline APPX file to install & try it.
Download Locations for 8 Zip 22.214.171.124 APPX file
Important Notice: Now Due To Unspecified Limitations, You Can Not Use The Offline APPX File To Install It Any More.
To try to install it manually from an SD card, you should choose one of the server location above to get the offline 8 Zip APPX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.