Jump start your Lightroom 4.0 Leaning
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First Checkout the System requirements, then use this link to download your Free 30 Day trial.

Windows

Intel® Pentium® 4 or AMD Athlon® 64 processor
Microsoft® Windows Vista® with Service Pack 2 or Windows® 7 with Service Pack 1
2GB of RAM
1GB of available hard-disk space
1024×768 display
DVD-ROM drive
Internet connection required for Internet-based services*
Mac OS

Multicore Intel processor with 64-bit support
Mac OS X v10.6.8 or v10.7
2GB of RAM
1GB of available hard-disk space
1024×768 display
DVD-ROM drive
Internet connection required for Internet-based services*