Can the Nu-Link driver be installed for both Keil RVMDK UV4 and UV5?

[a_ziliu]

Yes.
When installing the Nu-Link driver, the user has to specify the directory for development tools (e.g. Keil and IAR) because the directory for different versions of the development tools is different.
As shown below, the installation directory for Keil RVMDK UV5 is C:\Keil_v5, and the installation directory for Keil RVMDK UV4 is C:\Keil. The version of the development tool can have debugging function only when the correct installation directory is specified.