Hi Hasse, StairDesigner doesn’t run the print feature. This is part of Windows.
The likely cause is that your printer drivers are out of date so please consider updating them. You can also install a print to PDF ‘printer’ like ‘PDF Creator’ or depending on your version of Windows you might have ‘Microsoft Print to PDF’ installed already.
You can create a PDF then print that. If you still cannot print the PDF, certainly check the print drivers, or email it to another computer to print out if you’re in a rush.