Installing Odrive fails on Raspberry Pi

pip3 install odrive fails with the following error:

Defaulting to user installation because normal site-packages is not writeable
Requirement already satisfied: odrive in /home/ubuntu/.local/lib/python3.5/site-packages (0.4.11)
Requirement already satisfied: PySerial in /usr/lib/python3/dist-packages (from odrive) (3.0.1)
Requirement already satisfied: matplotlib in /home/ubuntu/.local/lib/python3.5/site-packages (from odrive) (3.0.3)
Requirement already satisfied: requests in /usr/lib/python3/dist-packages (from odrive) (2.9.1)
Requirement already satisfied: PyUSB in /home/ubuntu/.local/lib/python3.5/site-packages (from odrive) (1.0.2)
ERROR: Could not find a version that satisfies the requirement pywin32>=222 (from odrive) (from versions: none)
ERROR: No matching distribution found for pywin32>=222 (from odrive)