I am using an old TI-nspire CAS Touchpad version 3.9.0.463 and successfully installed ndless, however when I try installing the latest nPDF.tns version 0.4 beta nothing happens and it won't install or open on the calculator. I was going to try older versions of 0.3 and 0.2 but couldn't find the .tns files anywhere. Any chance someone could help or send the older versions for me to try? Thanks so much!