Download OpenFace 2 executable (FeatureExtraction) for Windows from the OpenFace 2 release page or compile from scratch for Linux and put it in the app/pipeline directory.
Then, in the projects root directory:
conda create -c conda-forge montreal-forced-aligner --prefix aligner
conda activate aligner
python -m venv venv
source ./venv/bin/activate # Done differently on Windows
python -m pip install -r requirements.txt
mfa server start
mfa model download acoustic english_us_arpa
mfa model download dictionary english_us_arpa
cd app
flask run