The second sentence should use the past participle: She was appointed as the Chairperson of the company. Both sentences have essentially the same literal meaning, but "Install" and "appoint" have slightly different connotations. " Depending on the context, it can have connotations of an illegitamate appointment to a position.
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Mr. TomWould you say that install and appoint sound the same here?
She was installed as the Chairperson of the company.
She was appointed as the Chairperson of the company.No. To appoint is simply to place into a position of responsibility. To install is to