The CD has both the PC and MAC program installation files on it ... the only really good reason to buy the CD is if you need to install on both OS. If you used the CD to download the first time you must always use the CD to install everytime so make sure to keep the CD in a save place. If you used the download option the first time you must always use the download option. You cannot "mix and match" ... that is the limitation of the CD product ... so pro and con. Once you learn the rules life is good.
