ucrtbased is debug version of the C++ runtime. It is only designed for development. The debug version is part of the Win10 SDK. If you install VS with C++ workload then it'll get installed. Note that the DLL is actually copied from the SDK directory to the system directory so it is in the search path. You could just go copy the binary yourself as well.
If an app installer removed that binary then the app installer is installing a file it shouldn't as that DLL is a runtime DLL. If this is a current app installer then I'd notify the publisher so they can address the issue. If they need a copy of that binary then the "correct" approach would be to keep a copy in their local install directory instead. Of course that could cause problems if they don't also include other runtime DLLs that might rely on it. But this is a debug version of the DLL anyway so they really shouldn't be shipping a copy of a debug DLL as that isn't going to work on most peoples machines.