It looks like you have a data path problem. Are your *.rdg files etc all in the same folder as the Enviromon executable?
If not, firstly run Enviromon and select Settings, Configuration, General, Directories and delete the data path.
Next close Enviromon right down, then copy all of the files from the directory C:\Program Files\Pico Technology\Enviromon into the same directory that the Enviromon executable is in.
I was able to see your graphs once all files were in the same folder, so I hope it works for you too.
I would need to see your user.psc file to comment on your percentage question but feel free to post this too.
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