https://support.microsoft.com/en-us/help/4570012/cumulative-update-7-for-sql-server-2019
https://download.microsoft.com/download/6/e/7/6e72dddf-dfa4-4889-bc3d-e5d3a0fd11ce/SQLServer2019-KB4570012-x64.exe

Cumulative Update #7 for SQL Server 2019 RTM (Removed)
Edit (9/23/2020)
There is a known issue with using database snapshots in SQL Server 2019 CU7, and it was removed from the Download Center, the Microsoft Update Catalog, and Linux repositories. Note that using DBCC CHECKDB is also affected because it generates a database snapshot. This issue will be fixed in the upcoming SQL Server 2019 Cumulative Update (CU).
https://techcommunity.microsoft.com/t5/sql-server/cumulative-update-7-for-sql-server-2019-rtm-removed/ba-p/1629317