http://bonyg5gd2cszplkckqffzfcefig5jldgwt36gm2jqdaezlgs3nrfhjid.onion/bible/content/bible/miscellaneous-information/openbazaar/installing_on_whonix/index.html
If you see two, one of it should be called something like “openbazaar2_2.0.18_i386.deb.part” which means that the download is still running. Wait for the second file to automatically disappear which means that the download finished. Once that happened, right click on the remaining downloaded file -> select “Properties” -> switch to the permissions tab -> check the checkbox called “Is executable” and click the “OK” button.