I have LR5 which I updated from LR3 years ago with a purchased disc. I have a new camera which is not supported by LR5 and i need LR6 to PP the RAW files. I don't want to sign up to the monthly plan and I can get LR6 for about £111 on Amazon back order or £119 from John Lewis. If I purchase the disc should I uninstall the LR5 and then install the LR6? - just to keep the PC 'clean'