The free version should have a PC Download option. It lets you download your data via a web browser on your PC.
Your device and computer should be on the same wifi network.
On your device in Helium-
Click menu/ PC Download. Your device will now display "Helium server is running" and show you the IP address of your phone with a port.
On your computer -
Open any web browser, in the URL bar enter the complete IP address being displayed on your phone.
You will be presented with Helium's web interface where you may select what apps you want to backup and the toggle "data only option".
Your browser will then start to download a zip file of your backup, if you opt to save the full apps + data the download can take some time.
In order to restore your zip file just run the Helium web server on your device, Launch your browser and select your zip file, or drag and drop it into the box and go from there.