My C5 Guestbook block is missing

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Hello!

This is the project:http://www.concrete5.org/private/sites/btw9twnarjybspjrf2lwj8oi...

I can't find Guestbook block anywhere.
I've tried to follow some instructions to clear it from root/packages and from the MySQL BlockTypes table to try to reinstall it afterwards, but with no success. I've deleted the block from root/packages and from the BlockTypes table, but it doesn't show up again on the Dashboard available blocks... Now it's nowhere to be found...

Any ideas?

Thanks!

rubencouto