Note that to install any MS program included on IEs4Linux, you need a valid Windows license. IEs4Linux will not ask for it and you can run everything without any problem even if you don't have a license. But it is illegal and a I have nothing to do with this.
And you should accept the Adobe Flash EULA too.
More detailed answer
MS IE license says:
NOTE: IF YOU DO NOT HAVE A VALID EULA FOR ANY "OS PRODUCT" (MICROSOFT WINDOWS 95, MICROSOFT WINDOWS 98, MICROSOFT WINDOWS NT WORKSTATION 4.0, MICROSOFT WINDOWS NT SERVER 4.0, MICROSOFT WINDOWS NT SERVER, ENTERPRISE EDITION 4.0 OR MICROSOFT WINDOWS NT SERVER 4.0, TERMINAL SERVER EDITION), YOU ARE NOT AUTHORIZED TO INSTALL, COPY, OR OTHERWISE USE THE OS COMPONENTS AND YOU HAVE NO RIGHTS UNDER THIS SUPPLEMENTAL EULA.
That is: you must have a valid OS license (any Windows version greater than 95). But this EULA does not say that you have to install on Windows. So, you need a valid Windows license, but you can install on Linux.
IEs4Linux can't know if you own this Windows license or not. This software is provided only to people that own this license. If you use IEs4Linux without owning a Windows license, it may be illegal to use IEs4Linux in your country.