Can I upgrade to 10.5 and buy the flawed Quicken Elements?

Running 10.4.11 on an old iMac G5 and Quicken 2007 for Mac. As of November I suddenly cannot download transactions from my bank (TD Bank). After hours of telephone conversations with TD Bank's technical staff and Quicken Help, I have been informed that the bank transactions will no longer work on Quicken 2007 for Mac. So, can I upgrade my 10.4.11 to a 10.5 and then buy the (Iknow badly flawed) Qucken Elements in order to maintain my Quicken bank transaction services (in place since 2003)?

Any help would be appreciated.