I have McAfee anti-virus software on my laptop (Windows 11) and the latest version of LR Classic. When I tried to download and install NLP McAfee blocked the installation. I tried several times - same every time. I contacted McAfee and the solution is as follows:
Open up McAfee
Turn off Real Time Scan
Turn off Firewall
Only now download and install NLP
Open up LR to check proper installation
Go back to McAfee and turn Real Time Scan and Firewall back on again.
Open up LR and check again.
This sorted it for me and I hope it helps anyone else having the same problem.