As far as I know, there is no method for downgrading to cPanel 12.24.x as it has been removed out of their Stable tree.
Both of your arguments for wanting 11.24 are completely invalid and wrong ....
Also, unless you have configured your WHM to allow for rollbacks, there is no way to go back to an old version (not recommended anyway) without redeploying the whole server from scratch.
Furthermore, even to do what you ask you would need your own copy because all branches are now officially 11.25 and some of these for a very, very long time now which means any new installs and updates irregardless the branch are going to be 11.25 now.
Also, unless you have configured your WHM to allow for rollbacks, there is no way to go back to an old version (not recommended anyway) without redeploying the whole server from scratch.
Furthermore, even to do what you ask you would need your own copy because all branches are now officially 11.25 and some of these for a very, very long time now which means any new installs and updates irregardless the branch are going to be 11.25 now.