Christmas LED lights connections
The LEDs must be connected in series strings of LEDs.   A string of 8 LEDs would work, with a single small resistor to linit the current.  Connect ten strings in parallel, and you have 80 LEDs.
Alternatively, connect eight strings of ten LEDs, and rely on current limiting in the power supply.  This will work if the LEDs in the strings are all matched.
For the 4.5V version, connect all the LEDs in parallel, with a single current limiting resistor.  Again, all the LEDs need to be reasonably well matched.