Installing dotetnuke 4.x skins to dotnetnuke 5.x

• If skin and container both are in single package, extract the zip files and rename Skins.zip to skinname.zip
• Login to your host account in dnn 5.x installation
• Go to Host > Extensions if you want to install the skin at host level, otherwise go to Admin > Extensions
• Switch the mode to Edit if it is not already in Edit mode
• Click on install extensions
• In the Extension Installation wizard, select your skinname.zip file and click on next.
• It will show you this message:
  "This package does not appear to be a valid DotNetNuke Extension as it does not have a manifest. Old (legacy) Skins and Containers do not contain manifests. If this package is a legacy Skin or Container Package please check the appropriate radio button below, and click Next"
• It will show 3 Radio buttons, Choose Skin and click Next
• Follow the installation wizard by clicking 'Next' throughout the wizard.
• Now to install container of the container of the skin, rename the skinname.zip back to Skins.zip and rename Containers.zip to skinname.zip.
• Follow the same step as above accept for the radio button where you choose Skin, you just need to choose Container this time.
• That's it. We are done with the installation! Happy Administration!
  

Please read the following this article about creating skin package for dotnetnuke 5.x from the skin package of the skin for dotnetnuke 4.x