Not sure how much Linux you know.
After download, you'll want to open a terminal window, and we'll use the tab key to complete some commands.
Get into the downloads area -
cd $HOME/Down(tab key)
Next, make sure that
FeedPanda-RELEASE-Jewel-Linux.tar.gz is there -
ls -lFa
Next, comfirm that you have a good download -
md5sum Feed*gz
Confirm to -
0125966552a70f5b648b17c8949ef338
Next, if that's the only file there, you need to unzip and unarchive it -
tar zxf Feed(tab key)
Confirm you have a file called FeedPanda -
ls -lFa
Now - go munch some bambo!!!
sudo ./FeedPanda
Make sure to get in that ./ because it means: don't search for it, it's right here.
Hope that helps.