downloading problem w/ newly bought MAHOMA pp by Mogstad & Lima

[willbs2003]

please help!! just bought this kit today and when unzipping the said file, it said 'either multipart or corrupt zip archieve'. i've tried renaming the unzip file but still giving me the same comment, done the downloading 3x and still the same. could there be any problem with the file? the rest that i bought were okay.
ATTN: Dani Mogstad & Miriam Lima?
pls. help...