After running the upgrade command via pip install, you should restart the python kernel and reload the pytrend library.

I had the same problem even after updating the module with pip install --upgrade --user git+https://github.com/GeneralMills/pytrends and restart python.

But, the issue was solved via the below method:

Instead of

pytrends = TrendReq(hl='en-US', tz=360, timeout=(10,25), proxies=['https://34.203.233.13:80',], retries=2, backoff_factor=0.1, requests_args={'verify':False})

Just ran:

pytrend = TrendReq()

Hope this can be helpful!

TLDR; I solved the problem with a custom patch

Explanation

The problem comes from the Google bot recognition system. As other similar systems do, it stops serving too frequent requests coming from suspicious clients. Some of the features used to recognize trustworthy clients are the presence of specific headers generated by the javascript code present on the web pages. Unfortunately, the python requests library does not provide such a level of camouflage against those bot recognition systems since javascript code is not even executed.
So the idea behind my patch is to leverage the headers generated by my browser interacting with google trends. Those headers are generated by the browser meanwhile I am logged in using my Google account, in other words, those headers are linked with my google account, so for them, I am trustworthy.

Solution

I solved in the following way:

1. First of all you must use google trends from your web browser while you are logged in with your Google Account;
2. In order to track the actual HTTP GET made: (I am using Chromium) Go into "More Tools" -> "Developers Tools" -> "Network" tab.
3. Visit the Google Trend page and perform a search for a trend; it will trigger a lot of HTTP requests on the left sidebar of the "Network" tab;
4. Identify the GET request (in my case it was /trends/explore?q=topic&geo=US) and right-click on it and select Copy -> Copy as cURL;
5. Then go to this page and paste the cURL script on the left side and copy the "headers" dictionary you can find inside the python script generated on the right side of the page;
6. Then go to your code and subclass the TrendReq class, so you can pass the custom header just copied:

from pytrends.request import TrendReq as UTrendReq
GET_METHOD='get'

import requests

headers = {
...
}


class TrendReq(UTrendReq):
    def _get_data(self, url, method=GET_METHOD, trim_chars=0, **kwargs):
        return super()._get_data(url, method=GET_METHOD, trim_chars=trim_chars, headers=headers, **kwargs)

7. Remove any "import TrendReq" from your code since now it will use this you just created;
8. Retry again;
9. If in any future the error message comes back: repeat the procedure. You need to update the header dictionary with fresh values and it may trigger the captcha mechanism.

I was having the same issue and did something really similar to Antonio Ercole De Luca. For me, however, the issue was with the cookies and not the headers.

I created a subclass like Antonio did, but this time modifying the cookie method:

cookies = {
    "SEARCH_SAMESITE": "####",
    "SID": "####",
    .
    .
    .
}

class CookieTrendReq(TrendReq):
    def GetGoogleCookie(self):
        return dict(filter(lambda i: i[0] == 'NID', cookies.items()))

And I used the same method to get the cookies as he did to get the headers:

1. visit trends.google.com
2. open developer tools and go to the network tab
3. make a search, and then right-click on the top GET request (should look like explore?q=…)
4. copy the request as bash-cURL
5. paste this into curlconverter.com and get the cookies!