Hi,
I succeeded to remove this problem by installing first vc_redist.x64.exe(See URL below), restart my PC, and then run the Cakewalk install from BandLabAssistant.
> vc_redist.x64.exe is here https://support.microsoft.com/en-us/topic/the-latest-supported-visual-c-downloads-2647da03-1eea-4433-9aff-95f26a218cc0
Error : DLL/OCX: RegSvr32 failed with exit code 0x3
System :
Windows 10 Pro
Dell Inspiron 5482
Visual Studio 2019 and VSCode installed
For your information... Thanks.