Hi @Ken, as the Appybuilder community has been closed, some of your your extensions are lost like the tableview extension, others are still available at web.archive.org...
what about checking your extensions in the extensions directory and upload them again here into the App Inventor community? Also @Hossein is invited to provide a link to an archive of the closed Appybuilder community...
Taifun
PS: I now created a new thread and uploaded version 3 of @Ken's tableview extension there