Installer failed immediately after pre-upgrade step because of Space Issue or Upgrade process got interrupted due to some reasons during pre-ugrade st
Pre-upgrade step will not delete old “diserver/’ folder during upgrade process. It will rename it to “__diserver/” just for the fall back purpose. If upgrade process got interrupted in between then user can start upgrade again by renaming “__diserver” to “diserver”. Make sure to remove/rename half upgraded “diyotta” folder.