I also had the same issue with the portlet , so I contacted zylk.net people and kindly they replied me with some more instructions that were missing above , also they assured me thart it was going to be solved ASAP.
Meanwhile I attach here the missing ones :
Its just to add to the portal-ext.properties the following ones :
layout.static.portlets.all=cookiespolicynotification_WAR_cookiespolicynotificationportlet
portlet.add.default.resource.check.whitelist=3,56_INSTANCE_0000,58,82,86,87,88,103,113,145,164,166,170,177,cookiespolicynotification_WAR_cookiespolicynotificationportlet
com.liferay.portal.servlet.filters.cache.CacheFilter=false
And now irt works wonderfull!!
Greetings