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you may try in 2 steps :
F18 -> F21 with fedup
f21-> f24 with dnf-plugin-system-upgrade, http://koji.fedoraproject.org/koji/buildinfo?buildID=694582

Also you may try in one shot with yum
https://fedoraproject.org/wiki/Upgrading_from_EOL_Fedora_using_yum#Fedora_18_-.3E_Fedora_19
but you have to read all problems on upgrade to see if it is possible ...