IE9 was originally released on March 14, 2011. While some archive sites may host "portable" versions, these are and are often bundled with security risks. If you must use a specific version for testing, a virtual machine with an older OS is the only secure way to do so.
A: No. Microsoft never released any portable browser. The closest official offering was the “Windows 7 IE9 VMs for developers,” which expired in 2022.