A workaround exists to use transdroid search on recent versions:
Workaround for non-rooted devices:
Create the directory /Android/data/hu.tagsoft.ttorrent.lite or /Android/data/hu.tagsoft.ttorrent.pro on the external sdcard, depending on your app version, and select this directory as the save path. Please note that the files downloaded to this location will be removed if you uninstall the app.
Update: From version v1.3.1 the app will create the necessary folder on the external sdcard.
My device has been upgraded to KitKat, and now I cannot download to my external sdcard. I get a permission denied error. Why? When will you fix it?
This is a problem with Android 4.4, not the app. The KitKat system denies write access to the external sdcard. A workaround exists only for rooted devices. We cannot fix it on our side.
See these links for further information:
The workaround for rooted devices: