Firstly, you take the 2 engine mount bolts & nuts out from the passengers side,,, then jack the engine up on that side,

2ndly you undo & remove the 2 vertical bolts that mount the bottom radiator bracket to the engine mount bracket (Not the 2 bolts that are located side ways through the lower radiator bracket to the lower radiator cowl, just leave them there),

then with the top radiator bracket & both top & bottom radiator hoses un-clamped, it’s just a matter of lifting the whole assembly, radiator with cowls attached , in one big bit, straight up & out of the hole... easy-peasy

The bracket would still be held in place with the engine mount. Also the long bolts are a pain to get out anyway.
The red ones give easy removal but refitting can be pain to line them both up again. Just persevere.