This is an electronic DOWNLOAD of the ASA AMT Airframe Prepware software. It is the exact same as the CD-ROM version, except that you must download the software and apply a license code after downloading. The download is approximately 250 MB and may take a while on slower connections. You do NOT need a connection to the internet after the software has been downloaded and activated. The software can be used offline once activated. Requirements: Windows compatible processor, 800 MHz or faster (Windows XP), 1.0 GHz or faster (Vista and Windows 7). 345 MB available hard drive space. 256 MB System RAM (Windows XP), 512 MB RAM (Vista), 1024 MB (Windows 7), 2048 MB (Windows 8/8.1), 4096 MB (Windows 10). Microsoft .Net Framework v4.0. If your system does not have this version of .Net Framework already installed, the Prepware installer will install the correct version before installing the program. Macintosh computer with Intel processor. 324 MB available hard drive space. OS X Snow Leopard (10.6), 1024 MB RAM. OS X Lion (10.7), OS X Mountain Lion (10.8), OS X Mavericks (10.9) 2048 MB RAM, OS X Yosemite (10.10) and El Capitan (10.11) 4096 MB RAM. Includes Prepware download and 24-month subscription to Prepware Online! 2023 Edition.