Looks like there was a kernel update, that probably broke some things.
Warfare777 You should be able to use a file manager as a picker. I can use NextApp file explorer to pick files when the picker dialogue box pops up. Install a file explorer ...
I have an XT1526.
I tried to install multiple time and wiped system, data, cache, Dalvik / ART Cache before trying to install each time. I also re-downloaded the .zip and tried again with the same results.
LOS 14.1 installs without error.