Please refer release notes of AEM 6.2 SP1 at . Note that you require Hotfix 12785 version 7.0 for AEM SP1 to install.
Installing Hotfix 12785 will result in high CPU utilization, Adobe recommends restarting the instance to free up system resources before installing AEM 6.2 SP1. Do not restart the AEM instance immediately after the dialog prompts you to restart it after the hotfix is installed. Wait untill the error.log to stabilize and the following entry to appear in the file, which confirm a successful installation: