I did this with a couple of them that I had. I had to create a blank widget in Adobe Flash builder with a blank mxml and blank xml file in the new widget folder. Once that was done, I copied the code from the old uncompiled widget and pasted within my new mxml file. I then had to check to make sure any objects called still exist in 2.4, or if they are just named something different (checking code). Do as I stated above for compiling, and recompile it. That's all I can suggest. You cannot make 2.3 coompiled widgets work in 2.4 that I know of. Hope that helps....