As long as your software is v20.xx (e.g., v20.01, v20.03, or v20.04), you can download to and go online with a controller running firmware 20.12 .
: V20 is the highest version supported by many older "Standard" series controllers (like the L61) that lack the memory or architecture to run V21 or higher. Installation and Operating Systems rslogix 5000 firmware 20.12
