Help needed please! I'm not experienced in technical stuff when it comes to things like this? I have just taken charge of a late 2015 Macbook pro that has Big Sur installed and I wanted to know the following if someone can help? I wanted to install El Capitan to run my older stand alone software (Indesign CS6, Photoshop CS6, Illustrator CS6) which is all i really use and need but I would like to have the option of being able to run Big Sur and as and when I want to for newer applications that will not run on an older Mac operating system? Is this possible? I understand the two operating systems run with a different filing system HFS+ and APFS, does this stop me doing what I want to do? I hope someone can help. Many thanks. Neil