The v1.1 update was a critical "maintenance" release for Windows users. If you are digging this out of your archives, here is what this specific version brought to the table:
Resolved various small stability issues that plagued the initial Mk2 release. Can You Run It Today? Steinberg LM4 Mk2 v1.1 [WiN]
Classic Beats: Resurrecting the Steinberg LM4 Mk2 in the Modern Era The v1