I want to upgrade existing shop from 1.8.1.0 to 1.9.3.2
What are the steps should be followed to accomplish this work?
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Sign up to join this communityPlease follow of this official documentation
http://devdocs.magento.com/guides/m1x/install/installing_upgrade_details.html
Follow the Steps
Step1:- First, check that core file is change or not using below link
Link:-https://blog.amasty.com/freebie-magento-modified-core-files-report-by-amasty/
This step for only security person you can skip this if you don't change anything in Magento Core Files.
Step2: - Upload Magento 1.8 Database in PHPMyAdmin
Step3: - Setup Magento 1.9.3 and while installation Select Magento 1.8 Database
Step 4: - Take Custom Modules and Extensions files[1.App 2.Skin 3.Js] from Old Magento
This is the best and Secure way to Upgrade Magento