The upgrade tasks were not run as they are part of lazy migration[2]. So, you can ignore the message and start the AEM instance with "-Dcom.adobe.upgrade.forcemigration=true" VersionRangeTaskIgnorelist[1]: The VersionRangeFilter defines the VersionRange for which a CodeUpgradeTask needs to be run. V...

After speaking to Engineering team, it looks like that API is appearing in the deprecated jar because it contains deprecated methods. @deprecatedString getFlashTemplatesServer(S7Config s7Config); The interface itself is not deprecated, so as long as you don't use an @deprecate method, you should be ...

Issue is caused by missing Provider-Capability attribute: Unknown Provide-Capability attribute type for 'filter' : JavaSE:version:List. Retrying late Check [1] for more details, Add the attribute , rebuild the bundle and try again. [1] https://bnd.bndtools.org/chapters/230-manifest-annotations.html

Can you share the error you are getting when trying to save the namespace?

Can you try this on a new instance without custom code? Also, Check if you are starting instance with "samplecontent" as nosamplecontent will not have any predefined templates to create XF. Ideally, you should see a Create button at the top right. 

Can you try using "uber-jar-6.5.3-apis-with-deprecations.jar". I can find those api's in that package. [1] https://repo.adobe.com/nexus/content/groups/public/com/adobe/aem/uber-jar/6.5.3/

Some incorrect CSS/JS files might have been cached on dispatcher which is causing the issue(Assuming this works fine bypassing author) Can you try clearing the dispatcher cache and check if this is still an issue?  

If you are talking about AEM as a cloud service , you can check [1] For Adobe Managed Server installation, there are 2 flavours(AMS Basic and AMS Enterprise). check [2] for more details. [1] https://docs.adobe.com/content/help/en/experience-manager-cloud-service/overview/what-is-new-and-different.ht...

You need to get in touch with the sales team[1] Or CSM if you are already engaged with Adobe. There are no public trial version available for AEM [1] https://www.adobe.com/request-consultation/experience-cloud.html

Have you tried the XML addon plugin with AEM? Check [1] for more details. [1] https://www.adobe.com/ca/products/xml-documentation-for-experience-manager.html