Duplicate Rows of a Query (Power Query)

Hi,

Try this M code

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjQ2NVfSUTJVitUBcswMzIAcYwjH0AjEMVKKjQUA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type text) meta [Serialized.Text = true]) in type table [ID = _t, Installments = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"ID", Int64.Type}, {"Installments", Int64.Type}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Custom", each {Number.From(1)..Number.From([Installments])}),
    #"Expanded Custom" = Table.ExpandListColumn(#"Added Custom", "Custom"),
    #"Removed Columns" = Table.RemoveColumns(#"Expanded Custom",{"Installments"}),
    #"Renamed Columns" = Table.RenameColumns(#"Removed Columns",{{"Custom", "Instalments"}}),
    #"Changed Type1" = Table.TransformColumnTypes(#"Renamed Columns",{{"Instalments", Int64.Type}})
in
    #"Changed Type1"

Here is the result