Recently an old colleague of mine was Upgrading from CRM 2013 to CRM 2015, some of the solutions he wanted to try for 2015 trial online. When he was trying to upload CRM 2013 solution there he was getting the error:

This is because, solution upgrade is not allowed.

Although unsupported here is a resolution:

Step 1: Extract the zip file to your computer.

Step 2: Open solution.xml file and change the first line to this:

<ImportExportXml version=”7.0.0000.3544″ SolutionPackageVersion=”7.0″ languagecode=”1033″ generatedBy=”CrmLive” xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance”&gt;

WordPress does not let me paste closing ‘>’ tag but this needs to be put to the end of above line instead of &gt;

Step 3: Zip the file and import again. You will be able to import the solution to CRM 2015 online now.

Note: This should only be tried for trial/testing purposes, not for live systems. If you have a live system with this issue, contact Microsoft support and they will give you a way.

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Hope it helps!