can i download snow leopard 10.6 or newer

Model name: imac

Model identifier: imac9.1

processor name : intel core 2 duo

Processor Speed: 2.66 GHz

Number Of Processors: 1

Total Number Of Cores: 2

L2 Cache: 6 MB

Memory: 4 GB

Bus Speed: 1.07 GHz

Boot ROM Version: IM91.008D.B08

SMC Version (system): 1.45f0

Serial Number (system): W89166FC0TG

Hardware UUID: CE70454C-D38E-5B22-8BA9-528543CF55D3

Need to get this to play football manager 2013. The other option is i get more memory. Where can i get this?