I recently got Lightroom
For Lightroom CC, sign in to your Adobe account, download the Cloud app then download Lightroom CC.
For perpetual license versions, download the Lightroom installer from
Install then enter your serial number.
If you are asking about Installing the LR program from a DVD disc then you have a couple of options. you can "Download" the version of LR you have a serial number for from this site, Product updates , or you can buy any, that is ANY, External CD/DVD drive that connects by USB and it will work on any computer you have that has a USB port. If you have a Mac you don't have to buy an Apple Mac CD/DVD external drive. ANY brand will work. Most cost between $20-$30.