The OpenALPR open source packages are incompatible with the commercial packages. If you attempt to install the commercial software, you may see an error like the following:
The following packages have unmet dependencies:Depends libopenalpr2 (= 2.3.0-1build4) but 2.x.x-x is to be installed
You can see if you have open source code by running:
dpkg -l | grep alpr
If the version reports "2.3.x" then it is the open source version.
First you should uninstall any and all OpenALPR open source packages with the following command:
sudo apt-get purge -y openalpr libopenalpr2 libopenalpr-data libopenalpr-dev openalpr-daemon openalpr-utils python-openalpr python3-openalpr
Next you can install the commercial software with:
bash <(curl https://deb.openalpr.com/install)