Error 1722 & 1603 when installing Studio 2015

Good evening,

Working on a new computer, I tried to install Studio 2015 (Studio 2021 upgrade is planned soon) but it does not work.

The message "Error 1722" appears. I tried to delete/re-download the file and install it again but it still does not work. I also tried to follow the steps in order to install each component separately but I can't find them in the path indicated (C:ProgramData\Package Cache\SDL\SDLTradosStudio2015\modules, which does not exist on my computer, contrary to C:\ProgramData\Package Cache\SDL\Dependencies, in which all components appear).

Could you please help asap ?

Thank you very much.

Mélissa