You are downloading the TBlog XAP file v188.8.131.52 for Windows Phone. TBlog is a free and useful Social app: ***** The app name has changed from "Ported for Tumblr" to "TBlog" to comply app store policies. *****A full-feature 3rd-party tumblr client. ... You can now download the offline XAP file to install & try it.
Download Locations for TBlog 184.108.40.206 XAP file
Important Notice: Now Due To Unspecified Limitations, You Can Not Use The Offline XAP 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 TBlog XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.