Adobe shut down the CS3 activation servers in 2017. Even a clean copy will usually lock you out after a 30-day trial period.
: Since Adobe deactivated the CS3 activation servers in 2020, even legitimate serial numbers cannot be used to activate new installations. Software Stability adobe photoshop cs3 full version highly compressed exclusive
Because it is a legacy version from 2007, its requirements are very low compared to modern software: Adobe shut down the CS3 activation servers in 2017
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