If your machine has already installed SIF e.g. On your machine have 2.2.0 version of SIF , which is compatible for installation of Sitecore 9.3, while you want to install Sitecore 10.x on your machine than SIF showing message you need to uninstall SIF which is already exist and install SIF version 2.3.0, which is compatible to Install the Sitecore 10.x on your Machine.

Please find below the Uninstall and Install Powershell command for SIF.

Uninstall All Version: Uninstall-Module -Name SitecoreInstallFramework -AllVersion

List of Installed All Version: Get-Module SitecoreInstallFramework -ListAvailable

Install Required Version SIF: Install-Module -Name SitecoreInstallFramework -RequiredVersion 2.3.0

Uninstall Required Version: Uninstall-Module -Name SitecoreInstallFramework -RequiredVersion 2.3.0

Happy Coding 🙂