Brave not working on private mode

Dear all,

Every time I connect to brave in private mode, I get this message

“Our systems have detected unusual traffic from your computer network. This page checks to see if it’s really you sending the requests, and not a robot. Why did this happen?”

And the URL changes to

URL: https://www.google.com/search?q=brave&oq=brave&aqs=chrome..69i57l2j69i60l2.993j0j1&sourceid=chrome&ie=UTF-8&sei=0cEPaIj9FIaqkdUP2KfUwAU
https://www.google.com/sorry/index?continue=https://www.google.com/search%3Fq%3DGOOGLE%26oq%3DGOOGLE%26aqs%3Dchrome..69i57l4j69i65l2.1371j0j1%26sourceid%3Dchrome%26ie%3DUTF-8%26sei%3DP8EPaOvHO-abkdUPy9C4yA4&q=EhAqAQ4KCRDiMFHog_ipREQOGMCCv8AGIjC-LbosaoTuZewsAdxyESIGF87h0WN6AKze7C6dZUVUkEjveiDsjjtQXLHFV_fQFRAyAnJSWgFD

I am using BRAVE 1.57.64 and never had a problem. I cannot upgrade because my computer is too old for the update.
Please be advised that I have no internet connection problem, no VPN nothing .

Thanks for your help.