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You can try to fix it yourself by restoring the association of the .jar extension with the javaw.exe executable. .Right-click the JAR file and select Open With. Typically the javaw.exe file is in C:\Program Files (x86)\java\jre6\bin). Alternatively, start the installer from a command prompt with the following command: java -jar magnolia-enterprise-installer-x.y.z.jar. Make sure the file extension is .jar. Internet Explorer has a tendency to append or change it to .zip.

Other issues

H2 does not accept more than one connection

Our default configuration does not use server mode. Therefore, if you try to initiate a backup call using CLI or REST, it fails because H2 does not allow more than one connection at a time. This is a new issue in Magnolia (most likely due to H2 or Jackrabbit updates).

A temporary workaround is to make H2 run in server mode and adding AUTO_SERVER=TRUE in the URL parameters: 

<param name="url" value="jdbc:h2:${wsp.home}/db;AUTO_SERVER=TRUE" />

<param name="url" value="jdbc:h2:${rep.home}/version/db;AUTO_SERVER=TRUE" />

See 

Log full of index rules warnings when upgrading from 5.4.x directly to 6.0.x

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