The zero's are straight forward to install - just replace the bullet crimps on end of the LEDs cables with compatible connectors for the OEM harness & they will plug right in (or conversely change the crimps on the bike harness end to regular bullet style connectors)
The Track-01 is less trivial - it has a different connector arrangement with an intermediate connector - that is a little more awkward to feed the connector end through the washer & nut and also a pain to connect into the little adapter harness that comes with it. Connectors will also have to be replaced as above.
It's just fiddly however, not a huge shortfall.
Regarding resistors, that is just so primitive! (their purpose is to simulate a regular bulb's load by sinking additional current so the flasher relay doesn't think a bulb is burned out & make the flash rate quicker)
Much simpler to install &
far more effective is to get an Electronic flasher like relay
this one from SuperBrightLeds (scroll down to the 6th item) - the CF13GL-02 is the one for Triumph. Only 12.95 plus $5 shipping. The specs are
here. Takes all of 5 secs to install - unplug the old one & replace with this - 100% plug & play. That will restore the regular flash rate.