It would be hard to help you, since this combination is not supported, no one really use it. So either use AS4.12 or if you need V4.7, think about virtualization of Win10 and install AS to this virtual machine.
OK, thank you both @kovarj and @christoph.hilchenbac for your answers. I will try to install V4.12. But if try to connect to an PLC (XC90 for bieing more specific) that is using an v4.7 project, will it work or I will have to upload the new project with a specific firmware ?
you can not download project created in AS4.7 from AS4.12 without updating to AS4.12. And this means changes. Generally should be not a problem, if you do not have in your project something specific to AS4.7. I would get in contact to author of the project first, if this is not you