For UNIX O.S:
pip install git+https://github.com/mit-nlp/MITIE.git
For Windows O.S:
I solved my issue by doing the following, hope it helps someone in the future.
1) Firstly clone the git package from MITIE's official GIT page.
2) After downloading, Seems like ~\MITIE-master\mitielib
has a __init__.py
file which makes the directory a valid Python module.
Navigate to the ~\MITIE-master\mitielib
folder, it will look something like this:

3) Packages installed from pip reside in the C:\Anaconda3\Lib\site-packages\
directory. Make a new folder called mitie and paste the contents there.

4) Lastly modify your configuration file as follows, in the mitie_file key's value provide the path to the total_word_feature_extractor.dat file:
{
"project": "xyz",
"path": "C:\\Users\\xyz\\Desktop\\RASA\\models",
"response_log": "C:\\Users\\xyz\\Desktop\\RASA\\logs",
"pipeline": ["nlp_mitie", "tokenizer_mitie", "ner_mitie", "ner_synonyms", "intent_entity_featurizer_regex", "intent_classifier_mitie"],
"data": "C:\\Users\\xyz\\Desktop\\RASA\\data\\examples\\RASAFormat.json",
"cors_origins": ["*"],
"mitie_file" : "C:\\Users\\xyz\\Desktop\\total_word_feature_extractor.dat",
"aws_endpoint_url": null,
"token": null,
"num_threads": 2,
"port": 5000
}