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1) Disable Clean URL while installing
2) Default Timezone should be ZERO
3) Delete all watchdog INSERTS And also change its AUTO INCREMENT =1 ;
4) We check the latest Drupal 6 version in Drupal 7 upgrade.php so when there is an update in Drupal 6 change the version in the __requirements() in Drupal 7 and in the info.xml of Drupal 7 <min_require> tag.
5) Dont change 'datestamp' to timestamp in DB. It is the launch date
6) We do not copy .htaccess from /sites/default/files/.htaccess because Drupal creates it