Any one have any ideas on this if you have lowish space left. Trying to install 11.4.1 and getting same error message. Finder says I have 18GB free and Appstore lising says that its 8.1GB so not sure why it can't install.I read above that someone suggested that them having 17GB isn't enough space for the OS to run. My MacOS has 75GB and my Windows has 175GB as I only use MacOS for XCode and have a few utilities (Avast, Git, BBEdit, Slack) - What is the minimum space macOS needs, when installing it doesn't indicate that it needs to have minimum space to run efficiently. Surely having 20gb free would be sufficient?Any advice on this would be great, as I did shrink my Windows partition by 25GB, but can't find a way to expand my macOS one with the extra 25GB which is free on the drive now. I assumed this would be fairly simple, but looks like I may have to reinstall both systems to alter the sizes. Would rather do this once I have an indication of what macOS needs to run.