Unfortunately I released 0.9.0a5 without taking into account the quirks in LinuxMint (which does some things differently from Debian & Ubuntu). I have updated the installer to take these quirks into account but I won’t release it until I put out alpha 6. Meanwhile you can install alpha 5 like this:
sudo apt-get install python3-pip python3-wheel libimage-exiftool-perl python3-pyqt5 python3-setuptools python3-dev python3-distutils-extra gir1.2-gexiv2-0.10 libgphoto2-dev python3-arrow python3-psutil g++ qt5-image-formats-plugins python3-zmq exiv2 python3-colorlog libraw-bin python3-easygui libmediainfo0v5 python3-sortedcontainers
the run the installer as instructed i.e.
python3 install.py rapid-photo-downloader-0.9.0a5.tar.gz
Finally if you don’t have a bin directory in your home directory create it i.e.
mkdir ~/bin
then create a symlink from ~/.local/bin/rapid-photo-downloader in your bin directory i.e.:
cd ~/bin; ln -s ~/.local/bin/rapid-photo-downloader .
logout and login to have the application launcher appear in your menu.
Edit: you could also download the updated install.py which automates the process. Open
http://bazaar.launchpad.net/~dlynch3/rapid/zeromq_pyqt/files
and click the little arrow beside install.py