Problems trying to install forge 1.5.2 with the new minecraft launcher

[mosher66]

so i have mc 1.6.1 and i got the 1.5.2 on a seperate profile, i opened the 1.5.2 zip and dragged and dropped the contents of the 1.5.2 forge into it but i get this message

!  C:\Windows\system32\__rzi_0.306: Write error in the file __rzi_0.306. Probably the disk is full

    Access is denied.

 

so then i decided to unzip everything into the one folder and then rezip it into a jar file but when i select add to archive the screen suddenly turns purple and blank then reloads everything but the 1.5.2 folder is closed after everything apears and the add to archive window never apears, anyone got any help? (i know i can do forge on 1.6.1 but i want to use mo creatures which isnt on 1.6.1)

[OpposingForces]

the jar files from the new launcher are different then the ones from the old launcher. your best bet is to get the old launcher( see: Google) and use it to get the 1.5.2 jar file.

I could be wrong but i don't think so.