In the Reaper forum I can update old post as the "Edit" icon stays there after years n years. I just checked the Steinberg forum and it's the same deal as well as many others I would imagine.
If you need to update a post with new links ,new pics or new methods, you can't and have to add a new post way down under all the other posts.
Not sure what the thinking is behind this.
It might be like manuals, all the other companies had their manuals for download but not PG and if you posted a link to the manual it would be deleted.
But now https://www.pgmusic.com/support.manuals.htm