Hi Frank, it should have installed a file called f-ui.decls into your userlibs folder. If it didn't check the folder where you installed it to and see if it's there. There should also be a converter, help, samples and skins folder there as well.
If there isn't, then please remove it from your hard drive and redownload the setup file.
If there isn't, then please remove it from your hard drive and redownload the setup file.