I downloadedWF4 M160 yesterdayinstalled it today. It started up ok but I havent opened any files with it yet.
@Steve did you accidentally install the 64 bit versionon a32bitO/S, that may explain the error message you got.
Olaf suggested redownloading and reunzipping. This time I also used a different zip program and everything installed just fine.
Now for checking the older models issue...