How to downgrade a RPM??
 

I want to downgarde cpp 3.3x to cpp 3.2x. When i run rpm -e cpp3.3x ... error say ... /usr/bin/cpp is needed by ( installed ) Xfree86-4.3.0-42

You type in rpm -e --force cpp.3.x....

The "--force" causes the error message you mentioned to be ignored, just make sure you install your older rpm afterward, else Xfree might not work:-)

Also, you might need "--nodeps" some time, it ignores any dependencies (use with care).

Manuel