I purchased the Swiftkey.
after the update to 4.4.2 it stopped working and after reinstalling He wrote me a message that the installation failed.
Couldn't Install on USB Storage or SD Card
- Unmount the SD card. Install app, remount the SD card. This won't work as the HTC One does not have an SD card
- In the secure/asec folder, find and delete "smdl2tmp1.asec". Although I found the folder, it was empty and therefore I was unable to delete the file.
*Before update Swiftkey is worked.