: Because it is no longer supported, using Windows 7 on a device connected to the internet is considered a significant security risk.

: Tied to the first motherboard it is activated on; generally cheaper and meant for system builders.

: Can be transferred to another computer; usually more expensive.

Retail boxed and OEM versions are frequently available on eBay .

: Many modern hardware components (CPUs, motherboards) released after 2017 do not have official drivers for Windows 7. Buy WIndows 7 Professional license key - Microsoft Q&A

You anymore . Retail sales for the software officially ended in October 2013, and pre-installed versions on new computers were discontinued by October 2016.

Marketplaces like Amazon and Newegg may still list "New Old Stock" from third-party vendors. :

Additionally, Microsoft ended all official support for Windows 7 on . This means the OS no longer receives security updates, leaving it highly vulnerable to modern malware and exploits. Where to Buy (Authorized Resellers & Marketplaces)