Whenever you install new modules via Install-Module or update existing modules via Update-Module, new module versions are installed side-by-side.
If you always work with the latest versions of modules and do not need to access a specific older version, you might want to find outdated modules and remove them:
# get all installed modules as a hash table # each key holds all versions of a given module $list = Get-InstalledModule | Get-InstalledModule -AllVersions | Group-Object -Property Name -AsHashTable -AsString # take all module names... $list.Keys | ForEach-Object { # dump all present versions... $list[$_] | # sort by version descending (newest first) Sort-Object -Property Version -Descending | # and skip newest, returning all other Select-Object -Skip 1 } | # remove outdated (check whether you really don't need them anymore) Uninstall-Module -WhatIf
