You are downloading the Meetup Pro AppX file v22.214.171.124 for Windows Phone. Meetup Pro is a free and useful Business app: Meetup, find your people, set up your groups, share an ... You can now download the offline AppX file to install & try it.
Download Locations for Meetup Pro 126.96.36.199 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 Meetup Pro AppX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.