Have a look under Tools > Site Health to see if any anomalies are mentioned there.
Tom
(@esilverstrike)
I am having the same issue on one of my sites.
I update a plugin (I’ve tried 3 so far) and I get the error message
update failed: download failed. not found
The plugin does update though. If I refresh the page it shows it at the new version.
The only abnormalities I can find is: ‘Page cache is not detected and the server response time is slow’
When I updated plugins via Dashboard > Updates > Select plugin > Update, instead of going to Plugins > ‘There is a new version of.. update now’ I managed to update the plugin (WP Forms Pro) successfully, but also went on to say this:
Updating [plug-in name], updated successfully. Disabling Maintenance mode… Some of your translations need updating. Sit tight for a few seconds while they are updated as well. Updating translations for Elementor Pro (en_ZA)… Download failed. Not Found. All updates have been completed.
So I’m thinking the issue is with Elementor. Will log a ticket there