I really hope that this product isn't 'too old.' In the link above, it states: ' Adobe strongly advises against running unsupported and outdated software. Please go back and re-enter your serial number.' However, when I try to type in my serial number, it tells me that 'This is not a valid serial number. I initially installed it via disc but in order to fully install it and have it after the free trial, I was told I had to uninstall it and then reinstall it via this link: I am trying to install Photoshop CS2 but it is telling me I don't have a valid serial number.