As for legally,
1. GRANT OF LICENSE. This EULA grants you the following rights:
• Applications Software. You may only install, access, and run (“RUN”) one copy of the SOFTWARE PRODUCT, or any prior version of the SOFTWARE PRODUCT for the same operating system, on a single personal computer, (“COMPUTER”) for your personal, noncommercial use. If not prevented by copy protection technology, the primary user of the COMPUTER on which the SOFTWARE PRODUCT is installed may make a second copy for his or her exclusive and personal noncommercial use on a portable computer.