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Thank you for replying @maybellyne

1. The warning messages and fatal error only shows up once, when i was updating the plugin in the production environment (with CDN).
2. No affected at all. But I am trying to make sure it won’t cause any potential issues.
3. I tested it again in a testing environment (without CDN), this warning messages and fatal error didn’t shows up again.

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I have investigated for more details shown as below.

For Yoast SEO Premxxx Ver15.1, “/wordpress-seo-premxxx/inc/class-addon-manager.php” this path exist.
But for Yoast SEO Premxxx Ver19.5, “”/wordpress-seo-premxxx/inc/” this path is not exist.

Also my website has CDN service, it maybe the reason for “when the plugin files are cached and some old files are still used after updating the plugin.” ?

My assumption is the path is not exist and CDN cache caused this issues.
Is it seems like a temporary issues happened during the update?

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Please don’t mark this topic as resolved, until there is a reasonable explanation for why this warning messages and Fatal errors shows up during the update.

I really appreciate.