I don't mind a $20 gamble compared to $1000 or more for a new PC.
My DSL is 1.2 M so at that speed a 3.6GB download is about six to seven hours. In other words, I would probably ask someone I knew to download it for me.
From System Profiler:
Model Name: iMac
Model Identifier: iMac5,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 3 GB
Bus Speed: 667 MHz
EveryMac:
https://everymac.com/systems/apple/imac/specs/imac-core-2-duo-2.0-17-inch-specs.htmlScroll down and click "Maximum OS"