I have just installed Web Stat to try and use it before buying the plugins. The install proceeded uneventfully, and it seems to be working, however, the File check in SysInfo shows all but one of the files to be followed by a red graphic. func/checkversion.dta is checked green, but all the others are red, suggesting some sort of error. These were all uploaded according to the instructions and their permissions are set correctly. Any ideas would be appreciated as I don't wish to purchase plugins if my install is faulty.
;)

That's not a problem.
Read this topic for an answer by one of the makers.