Re-installing a scenario. Is it possible ?

Hello guys,
I am new to RS and I kept my MSTS maners so I did some mistakes as every beginer
I would like to know if it is possible to re-install a scenario from RS 2012. I did not cloned one and now I can't play it anymore
Thank you for your help.
I am new to RS and I kept my MSTS maners so I did some mistakes as every beginer

I would like to know if it is possible to re-install a scenario from RS 2012. I did not cloned one and now I can't play it anymore

Thank you for your help.