A versão da ferramenta que você está tentando instalar suporta apenas Windows 8.0
Aqui é a versão correta da ferramenta que suporta Windows 8.1
Aqui estão os requisitos para a versão que você tentou instalar:
Remote Server Administration Tools for Windows 8 can be installed ONLY on computers that are running Windows 8. Remote Server Administration Tools cannot be installed on computers with an Advanced RISC Machine (ARM) architecture, or other system-on-chip devices.
Aqui estão os requisitos para a versão que você deve instalar:
Remote Server Administration Tools for Windows 8.1 can be installed ONLY on computers that are running full releases of Windows 8.1 Pro or Windows 8.1 Enterprise. Remote Server Administration Tools cannot be installed on Windows RT, computers with an Advanced RISC Machine (ARM) architecture, or other system-on-chip devices. Remote Server Administration Tools for Windows 8.1 also cannot be installed on prerelease or evaluation copies of Windows 8.1.
Os seguintes requisitos são compartilhados entre as duas versões apenas trocam o 8.1 por 8.0.
Remote Server Administration Tools for Windows 8.1 is available in the following languages: cs-CZ, de-DE, en-US, es-ES, fr-FR, hu-HU, it-IT, ja-JP, ko-KR, nl-NL, pl-PL, pt-BR, pt-PT, ru-RU, sv-SE, tr-TR, zh-CN, zh-HK, and zh-TW. If the system UI language of your Windows 8.1 operating system does not match any of the available RSAT languages, you must first install a Windows 8.1 Language Pack for a language that is supported by RSAT, and then try installing Remote Server Administration Tools for Windows 8.1 again.
IMPORTANT: Remove all older versions of Administration Tools Pack or Remote Server Administration Tools—including older prerelease versions, and releases of the tools for different languages or locales—from the computer before you install Remote Server Administration Tools for Windows 8.1. Only one copy at a time of Remote Server Administration Tools can be installed on a computer. If you have upgraded to Windows 8.1 from Windows 7, you will need to install Remote Server Administration Tools for Windows 8.1 on the computer; no earlier releases of Remote Server Administration Tools are still installed on a computer that you have upgraded to Windows 8.1.