iMac 2007
Is it possible to upgrade my iMac 2007 from snow leopard to sierra at all and if so does anyone have a link please
Question marked as
The highest system you can pugrade to is El Capitan - see the link near the bottom of this page: How to get old versions of macOS - Apple Support - you will need to use Safari, other browsers may not work.
Note that you will need 10.6.8 to be able to proceed, and you must have a minimum of 2GB of RAM. If you don't I would be a bit dubious about the value of upgrading your mac given its age - and also even if you do upgrade your system you may find it running very slowly.