YNAB 4 is no longer for sale. But take heart, there’s something new!
Official support for YNAB 4 (the version you're using) ended in 2016. It was time. On the upside, it allowed us to create a web version of YNAB, which is lightyears ahead of YNAB 4. (Direct import of transactions from your bank, category targets, more mobile functionality...the list goes on!)
Read all about the new YNAB