Check your python architecture ( is it 32 or 64 bit)
Just type python and see

For 32:
- Open cmd in "Run as administrator" mode
- run the command
pip install robotframework-autoitlibrary
- Now clone the autoit library source code: nokia/robotframework-autoitlibrary.
- in the root directory run the below command:
python setup.py install
using cmd in admin mode
to navigate to root directory use the command pushd <filepath>' instead of
cd ` if cd doesn't work in cmd opened in admin mode.
For 64:
- Open cmd in "Run as administrator" mode
- Now clone the autoit library source code: nokia/robotframework-autoitlibrary.
- in the root directory run the below command:
python setup.py install
using cmd in admin mode
to navigate to root directory use the command pushd <filepath>' instead of
cd ` if cd doesn't work in cmd opened in admin mode.
You can install 64 bit python at:
Install 64-bit python , the default version is 32 so you ahve to downlad the 64 bit download file from: Python Releases for Windows
and download Windows x86-64 executable installer
and install it.
Check if 64 bit is installed:

Installed package :
Open cmd in "Run as administrator mode" and run below command
pip install robotframework-autoitlibrary
test.robot
*** Settings ***
Documentation This is the script for Create Sales Visit Repository
Library AutoItLibrary
*** Test Cases ***
Input Text
Send C:\\Users\\ruela\\Documents\\Different images format\\BMP.bmp
Ran as
robot test.robot