easy to fix. Grab from any conversion by REV0, Fabioddq, the following files:
precomp.exe, packjpg_dll.dll, & place them in same folder where compress.bat is. Make sure to replace the line: ( below in batch file )
arc a -ep1 -r -w.\ -mprecomp+srep+lzma:a1:mfbt4:d256m:fb128:mc1000:lc8 -dp"%choice1%" ."\Rayman Legends\%arc%"
then the files will compress properly. I'll upload the 'fixed' archive. Will post when its done, having issues getting uploads to show properly