So impressed by ReactOS 0.4.14

[ThFabba]

You'll need to look in the 0.4.13 branch in git, and find the commit matching the "gXXXXXXX" at the end of the iso name.
One way to list the commits there is to look at https://github.com/reactos/reactos/comm ... ses/0.4.13
So for RC41 you could use the "Clone or Download" button at https://github.com/reactos/reactos/tree ... 34b9f78b6b