This is the most confusing part for IT pros. Here is the rule of thumb for crruntime-64bit-13-0-20.msi :
Ensure that the application you are running is targeted for a 64-bit environment. If your application runs in 32-bit mode (x86), you will need the CRRuntime_32bit_13_0_20.msi instead. crruntime-64bit-13-0-20.msi