Class 'League\Flysystem\Adapter\AbstractAdapter' not found on upgrading

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We're trying to upgrade our website from concrete5 version to version 8.0.3.
If we upgrade concrete5 first, we get error.
Then we tried to update the add-on first.
On that case we found error.

So, how can we update our website as well as the addon?

Type: Pre-Sale
Status: Legacy: Invalid
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concrete5 Environment Information

# concrete5 Version
Core Version -
Version Installed -
Database Version - 20160615000000

# concrete5 Packages
S3 Storage (2.0.2)

Browser User-Agent String

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.95 Safari/537.36

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