Are you using an android device with KitKat 4.4? If so, it is not so much an update or upgrade of Calibre Companion, so much as a change in the external SD card permissions allowed by Android KitKat.
For further reading you'll want to check out this sticky:
https://www.mobileread.com/forums/sho...d.php?t=235710.
The workaround for using Calibre Companion and KitKat is located here:
https://www.mobileread.com/forums/sho...4&postcount=21.
And to specifically answer your question about where to locate manual path see:
https://www.mobileread.com/forums/sho...9&postcount=20