MarsUltor

My tekkit classic mod pack crashed yesterday and since it wouldnt load up i attempted to reinstall. it claimed that it cant delete the advanced machines mod client and when i attempt manual delete it says its being used by java, though the file is the only open program. Therefore im unable to fix/play tekkit classic, meaning im unable to use my donor rank. I will be forced to charge back since i wont be able to use the rank unless someone can help me fix this issue plz!

I bought a Gold rank a few months back and name changed. The purchase was under ImortalFart1 and i need it transfered to MarsUltor please and thank you