Original EEPROMex library can be found here

http://thijs.elenbaas.net/downloads/?did=3

This is a slight modification to original with possibility to store uint64_t type values.

Two new functions

uint64_t readLongLong(int address);
bool writeLongLong(int address, uint64_t value);
int getWriteCount();

Not implemented yet

bool updateLongLong(int address, uint64_t value);

The rest should be exactly like EEPROMex as of March 9th 2014.