Asics MetaSpeed Sky Paris

I bought a pair of ASICS METASPEED SKY PARIS (full carbon plate) a while back EUR size - 46 for marathon. I wore them once on an 18 mile run. These are the same as the ones that the top marathon athletes wore at the Olympics in Paris. Asics in 46 is actually a UK size 10.5. I’m UK 11 and by the end of the run they were killing me. I haven’t worn them since that first run and I cannot take them back as they have been used. Like new and still in their box. Value new is €250.00.