Am new to forum but would like to find an answer to this query please. Have recently updated Mac to Big Sur only to find that my Google Nik Collection has disappeared. Have downloaded the collection again  but when I come to reinstall I get this message: ' this version of Nik Collection requires Mac OS 10.7 or newer in order to proceed with the installation process. The Installer will now quit'. I'm running 11.0.1 Big Sur. Can anyone help?