What you have to do is not unzip the files, transfer the entire .cab file over, and then run the "program manager" on the smartphone, aim it at the .cab file, and run it, that will install cachemate.
That's what I did, and it installed just fine, but now I can't figure out how to use it. I found an old thread that mentions a readme.htm file, but that did not come with mine, and I can find it. The cachemate site is kind of sparse on documentation.
Do you have another program that you use instead of cachemate?