Invalid argument, and Z:\ Path

[TailsGuy]

I've tried to install several CIAs, with them only sometimes succeeding.
Typically, it fails and it puts out the last five lines, Traceback down to OSError.

10:41:33 - custom-install 2.1 - https://github.com/ihaveamac/custom-install
10:41:33 - Ready.
10:42:18 - Starting install...
10:42:18 - Finding path to install to...
10:42:18 - Extracting Title Database...
10:42:18 - Installing Persona Q2 - 00040000001d7100...
10:42:21 - Writing /title/00040000/001d7100/content/00000000.tmd...
10:42:22 - Writing /title/00040000/001d7100/content/00000002.app...
10:42:49 - Traceback (most recent call last):
10:42:49 - File "ci-gui.py", line 717, in install
10:42:49 - File "Z:\Projects\custom-install\custominstall.py", line 473, in start
10:42:49 - File "Z:\Projects\custom-install\custominstall.py", line 228, in copy_with_progress
10:42:49 - OSError: [Errno 22] Invalid argument