1.1: User reports that his activation code is not working.
### see note also in PKB copy: https://lumion-knowledgebase.zendesk.com/hc/en-us/articles/360014801779
this needs fixing for the Download Manager is obsolete - separate article and only deal with obsolete from old 8.5? older email on obsolete DLM.
which means this article could be made redundant by making sure invalid activation code entries are covered in the old and new DLM/Installer articles