Everything looked normal. The storage report showed 40 GB free. No Other category at all. And in the Applications folder, one new item:
Apple periodically removes older installers from the App Store. If you anticipate needing macOS Catalina 10.15.7 again (e.g., for tech support, refurbishing old Macs, or running legacy audio software), : macos catalina 10157 installer upd
If you’re looking for the official installer: Everything looked normal
With macOS Sonoma and Sequoia now available, why would anyone use Catalina in 2025 and beyond? for tech support