Direct link to SP5 https://experience.adobe.com/#/downloads/content/software-distribution/en/aem.html?package=/content/software-distribution/en/details.html/content/dam/aem/public/adobe/packages/cq650/servicepack/aem-service-pkg-6.5.5.zip

You can download the AEM 6.5 jar file from the software distribution portal: https://experience.adobe.com/#/downloads/content/software-distribution/en/aem.html?package=/content/software-distribution/en/details.html/content/dam/aem/public/adobe/packages/cq650/quickstart/cq-quickstart-6.5.0.jar

Are you request a URL with a query through an HTTPD+Dispacther? 

A page can be unlocked only by an admin is the lock owner 

This is not a trivial issue and can be caused by multiple factors. You can try to do basic troubleshooting: increase JSON calls, verify pageinfo, recompile clientlibs. The best is to open a support case and request a share screen session

AEM Forms Designer doesn’t make ‘regular’ PDF’. The designer makes XFA-based PDF’s and only Acrobat/Reader can open them. So, AEM Forms Designer cannot produce PDF 2.0

It could be many different reasons for a scenario when you can not edit a component. One of many reasons is related to the failure of a pageinfo servlet. Please check a call similar tohttp://localhost:4502/libs/wcm/core/content/pageinfo.json?path=%2Fcontent%2Fwe-retail%2Fus%2Fen%2Fuser&_charset_=UTF...

Did you try to install SP5?

A page can be unlocked only by a lock owner or a super admin.https://docs.adobe.com/content/help/en/experience-manager-65/authoring/authoring/editing-content.html

OOTB AEM has Files report: http://localhost:4502/mnt/overlay/dam/gui/content/reports/createreportwizard.html  https://docs.adobe.com/content/help/en/experience-manager-65/assets/administer/asset-reports.htmlI believe that it should fit into your business requirements