I already had cpai 2.0.6 and the lpr module installed and working before updating BI to the latest with the lpr integration. It didn't go perfectly smoothly for me. After enabling the "ALPR for plates" (the new integration), AI wasn't working and BI got funky on my (triggered cameras froze forever, etc). The BI ai settings custom modules directory box was greyed out. I opened the CPAI control panel and it showed the lpr module got disabled. So I re-enabled it with gpu, started it, it went green, and worked in the cpai explorer. Then I tried clicking the 3-dot menu to set the custom modules directory in BI. That brought up a small window saying "Reloaded modules: Restart AI to refresh this list." So in BI I stopped and restarted AI. After that it seemed to work normally, even after a reboot.
So far the new local cpai alpr integration (that's a mouthful) seems to be working OK. It returns high confidence, but so far it is not as accurate as the online alpr integration. The inaccuracies manifest mostly as transposed letters, like H instead of M, O instead of 0, or cropping an end character, but it's good enough to use with some basic post processing for now. This is while I'm using the mainstream for AI and medium yolov5 model. Not sure if switching to high would help, but that's a lot slower and affects all cameras (not just the lpr's). Guessing not, since it uses ocr, which doesn't seem to use yolo (however license-plates does use yolo). So far I've only had 4 night plates pass by to test this... so could shake out differently as a wider variety of images come in.