Sorry you’re struggling with this, please just make sure you have the latest custom Kali 2020, run the installer as shown in the course, and then lets install the following libraries manually:

1. Download the needed packages from the following links

http://ftp.us.debian.org/debian/pool/main/m/m2crypto/python-m2crypto_0.31.0-4_i386.deb

http://ftp.us.debian.org/debian/pool/main/p/python-typing/python-typing_3.6.6-1_all.deb

2. Navigate to the location where they are downloaded (probably downloads).

cd Downloads

3. Install the downloaded packages in the following order

dpkg -i python-typing_3.6.6-1_all.deb

dpkg -i python-m2crypto_0.31.0-4_i386.deb

I just tried this myself and it worked on the custom Kali 2020.