How can I upgrade grandnode from version 3.60 to 3.70 ?
It's quite easy.
Step 1. First of all for safety reasons, make a backup of your site, database. This will allow you to restore previous data, regardless of how the update finished. Step 2. Download the newest package of GrandNode files. Step 3. Copy Settings.txt and InstalledPlugins.txt files into App_Data directory (If you store images in nopCommerce also copy (\Content\Images\)). Step 4. Replace GrandNode files with new version files. Step 4. Run http://yourdomain.com/upgrade Step 5. After finish copy back Settings.txt and InstalledPlugins.txt files into App_Data directory and (\Content\Images\). Step 6. Restart your application. Step 7. That's all.