While installing or upgrading to SPE 9.1, the installation abruptly aborted with error box: Install aborted: Error while setting up Rest API Service and centralized UI password parameter value.
The password provided during installation was created by a password generation program: The password contained one or both of the following special characters.
> { not valid to use as per SPE 9.x password requirements }
< { not valid to use as per SPE 9.x password requirements }
& { this character is supposed to be a valid special character but currently causes the install to fail }
Use the SPE 9 password requirements documentation as a guide for setting a valid password and avoid using the previously mentioned character that should be accepted but is not.