Is there anything else I can do?
(Sorry for insisting, but I need it to work tomorrow )

Still doesnt work :/ ''the document format is not supported''

It's both on the nPdf software itself and on the pdf files. I'll try mViewer. Thank you very much!

Hallo!! Thanks for answering! Yes, I installed the apropriate ndless version for my OS. I also converted my files to pdf.tns from the site. But then, it doesn't work. In order to install nPDF, do I have to do anything else than just transfering the file to my calc?

Hallo!! I am trying to transfer PDF files to my TI Nspire. I have downloaded nPDF and transfered it to my calc, but is sais that it is not supported. Do I have to do something to install it??