I downloaded the file indicated vc_redistx86.14.24.28127.4.exe.  It runs and installs fine.  I how have that listed in the Control Panel.  I re-booted and tried the PS2021 install again and got the same message.

It doesn't seem to matter which version of vc_reuntime I try to use for installation (and I have tried 8-10, both x64  and x68) all the error messages say I need 23918.  (Second oval above.