I would recommend grabbing an older package for the libraries, extracting them, then using a wrapper script to start the game. This worked like a charm for me!
Download the ".deb" package file:
https://packages.ubuntu.com/bionic/amd64/libssl1.0.0/download
https://www.gog.com/forum/mable_the_wood/libcryptoso100_not_found_on_ubuntu for the discussion on how to make use of the libraries contained in the package.
Extract the libraries:
$ dpkg-deb -x libssl1.0.0_1.0.2n-1ubuntu5.7_amd64.deb libssl
$ mkdir lib
$ mv libssl/usr/lib/x86_64-linux-gnu/* lib
runme.sh:
#!/bin/bash
# Adapted from:
# https://itch.io/docs/itch/integrating/platforms/linux.html
# Move to exe's directory (required for audio libs)
cd "`dirname "$0"`"
# Set the libpath and execute the binary
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:./lib/
exec ./where_is_2021 $@