Hope many getting the same version when trying upgrading from 1.4.2 to 1.5.
Try to follow below steps to resolve the issue…

1. Set folder permissions according to Magento Wiki

2. Clear out all downloaded extensions by running below mentioned script file…

sh /downloader/pearlib/clear
OR
those who didn’t have shell acess to run sh, please view that file. You can see that script deletes some of the files in this folder.

3. Disable Cache, remove current session and cache files from var folder.

4. Then run magento-core/Mage_All_Latest from Magento connect manager
After first run you may get same version again (1.4.2) .  But now you can able to upgrade by manually select each package or by running below string in key field.
http://connect20.magentocommerce.com/community/Mage_All_Latest

Feedbacks are very much helpfull…

  One Response to “Steps to upgrade magento from 1.4.2 to 1.5.x”

  1. Thanks for providing us with detailed and clear steps. Keep posting blogs like this..

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