Hi.
I had this problem too. I tried to read the README.md from https://github.com/facebookresearch/InferSent 23 carefully.
I found out that some changes have been made in the previous file. Therefore, you have to download all the files. Then, you should rewrite your code with respect to the explanation on the GitHub page.
As they have explained there, this the right way that you should set the path:
W2V_PATH = ‘fastText/crawl-300d-2M.vec’
infersent.set_w2v_path(W2V_PATH)