Mac storage basics · When the disk is full
Why does the App Store say there isn't enough space to install an app?
Short answer: Installing needs room for the download and for unpacking it, so free more than the app's size, restart, and try again.
The App Store needs room for the download and for unpacking it, so the free space required is larger than the app's listed size — big apps and games may need noticeably more.
Free some space (empty the Trash, delete old downloads and installers, remove apps you don't use), restart so temporary space is released, then try again. If the free space shown in Finder looks large but installs still fail, local snapshots may be holding space — see why Finder and Storage settings disagree.