You can download the Artistic Designer program from Janome, https://www.janome.com/products/software/
. However, it will not work unless you have purchased a license key from a dealer. For other Janome software, only updates for supported software are available: https://www.janome.com/support/general-support/software-support/
. You'll either need the program to have been installed on your computer or to put the CD in an optical disc drive. If your current computer doesn't have an optical disc drive, you can get a USB optical drive from Amazon or any other shop that has electronic/computer parts. USB DVD read/write drives are under $50 even at most shops that don't discount accessories. You may need the USB type C (M) to USB type A (female) adapter with some of the newest models (laptops and tablets).
I hope this helps. Please add a comment with the name and version of your software for further assistance. If your software is no longer supported by Janome, there are some third-party embroidery editing software packages. One is https://www.embird.net/