Hey there,
I am really sorry for the delay of this reply as it is a weekend for us here.
May i know how do you perform this update from your site backend?
Can you try download the latest launcher installer from
https://stackideas.com/dashboard then upload this installer through your Joomla backend installer page and see how it goes?
If the issue still persists, can you assign this 'stackideas' to have superadmin privileges so we can better have a check? Because I was unable to upload any installer through your backend, you can check my attached screenshot below.
By the way, may i know this community.xxx domain site is it your development site?