Pluck told you "update check failed". Why is this, and how can you check for updates?

Pluck uses the CURL-library from PHP to check for updates from the pluck server. This CURL-library therefore needs to be present on the server you are running pluck on. Unfortunately, not all servers have this library installed. If your server doesn't have the library, the error "update check failed" will be triggered.

Well, you can ask the administrator of your server to install the CURL-library on your server. The other thing you could do is check for updates manually by checking the main website. Or subscribe to the mailing list to keep up-to-date.

You can find more about plucks system requirements here.