First off, it appears that the setup and install (at least for client only) is missing a referance to msvcrt.dll, or it is not installed on the client computer. No technical expertise here, just an observation from trying to run ica -Registerservices at the command line, an error is thrown.
From what I've read, this error comes from a Vista .dll being located on a XP client. Version 1.9.5 (the beta candidate) works on both Vista and XP with very little configuration needed. I'm rolling back to it after my recent aggravation with 2.0.1