Open your OS's command-line (not python's command-line!) in the extracted folder and if you are in Linux type:
python proper.py instructions.txt
If you are in windows type
proper.py instructions.txt
instead.
Now that you have run instructions.txt with proper read it to understand how to create datafiles that proper understands. Click here for a video example.
After you know how to create such datafiles you can start using excel with proper. All you have to do is "reserve" one column to each variable and then export the sheet as .csv. Proper then detects the .csv exension, converts it to it's format and back out again. Now you only have to import the new file and you're done. Click here for a video example.
Proper can be customized to your needs and every parameter available for customization is stored in proper_config.py along with an explanation of what it does.
You can configure settings like your latex compiler, your pdf reader, should the pdf be open automatically or not.
You can also configure how proper processes the files if they are csv-files or not. For instance you can configure if proper should hide values that it considers clutter in your excel files only but not in your hand-made files, the number of default significant digits, and more...