The latest major version is {51_version} and the corresponding distribution name is `51x` (with an "x" as the suffix).
For older releases use:

* `51x` for C* {51_version} series
* `50x` for C* {50_version} series
* `41x` for C* {41_version} series

For example, to add the repository for version {51_version} (`51x`):
