In the J4 extensions list, and update to 10.01 was shown. Upgrading crashed the website with:
Class "AcyMailing\Libraries\acymObject" not found
both the admin and the front end were down.
Deleting the administrator/components/com_acym got our website back.
The only old version of AcyMailing I have is 9.72 and I can't get anything installed.
Can you please make the previous versions available until you have resolved this?