rem be sure to do not add space(s) at the end of the three next lines ;)
set patharia2=d:\
set verlessmsi=lessmsi-v1.1.6
set pathskype=skypesetup
set pathskype2="%pathskype%\sourcedir\Program Files\skype\phone\skype.exe"
set clean_pass=1
:clean_secondpass
del *.aria2
del *.msi
del *.msi.1
rd /S /Q %pathskype%
if "%clean_pass%"=="2" goto end
%patharia2%aria2c.exe http://www.skype.com/go/getskype-msi
%verlessmsi%\lessmsi.exe x SkypeSetup.msi
del skype.exe.bak
ren skype.exe skype.exe.bak
copy %pathskype2%"
@set clean_pass=2
@goto clean_secondpass
:end