Taking the device package of the STM32H7 series as an example, the download URL of the official website is
https://sadevicepacksprodus.blob.core.windows.net/pack/Keil.STM32H7xx_DFP.3.1.1.pack
, where STM32H7xx is the chip series number, and 3.1.1 is Version of device package
If you need to download device packages of other series and versions, just change the number and version in the website to the corresponding ones (provided that the entered series number and version number exist)