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Powershell/PowerShell-Office365Admin/MSOnline/BulkReplaceLicence.ps1

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+# Bulk replace a licence for all users who have the one being replaced.
+#
+
+# What licence are we removing?
+$licenceToRemove = ''
+
+# What licence are we adding?
+$licenceToAdd = ''
+
+# Import MSOnline module and connect
+Import-Module MSOnline
+Connect-MsolService
+
+# Find everyone who has the licence being replaced
+$users = Get-MsolUser -All | Where-Object {($_.licenses).AccountSkuId -match $licenceToRemove}
+
+# Remove the old licence and add the new one
+foreach ($user in $users) {
+    Set-MSOLUserLicense –user $user.UserPrincipalName –RemoveLicenses $licenceToRemove
+    Set-MSOLUserLicense –user $user.UserPrincipalName -AddLicenses $licenceToAdd
+}