Click on the menu item 'Products' and then on the tab 'Analysis'.
In general all sold products are displayed here.
To get an exact overview, you have to use the filters on the left side. If you want to know how many blockcards for ten visits were sold or how many units remain on them, you can use the filters 'Name > Is > product name (in this case, please note the exact spelling of the blockcard you have created)'.
You can download the analysis for further editing via the button 'Export overview' in the top right corner. The document can then be used immediately. Here you can see how to open the CSV file manually if something went wrong.