#Corrected code for plugin to work in SU 2024

  @@colorx = "Black"
  @@stipplex = "_"

  def initialize
    @endpoints = false
    @change = false
    @colorlist = String.new
    colorlist = Sketchup::Color.names
    l = colorlist.size
    l = l - 1
    for e in 0..l do
      @colorlist = @colorlist + colorlist[e].to_s + "|" if e != l
      @colorlist = @colorlist + colorlist[e].to_s if e == l
    end
    cflag = false
  end

  def activate
    @model = Sketchup.active_model
    @ents = @model.active_entities
    @sel = @model.selection
    @lines = []
    show_status
    conversion
  end

  def show_status
    statustext = "Edges into \"" + @@stipplex + "\" construction lines and cline to " + @@colorx + " edges (Command)" if !@change
    statustext = "Construction lines into \"" + @@stipplex + "\" clines and edges into " + @@colorx + " edges (Command)" if @change
    statusoption = "; Draw end points (Alt)" if @endpoints
    statusoption = "; Endpoints not drawn (Alt)" if !@endpoints
    status_label = statustext + statusoption
    Sketchup.set_status_text(status_label, SB_PROMPT)
  end

  def conversion
    @model.start_operation "Line Conversion"
    view = @model.active_view
    if !@change
      for e in @sel
        if e.class == Sketchup::Edge
          lstart = e.start.position
          lend = e.end.position
          if @endpoints
            @ents.add_cpoint lstart
            @ents.add_cpoint lend
          end
          @ents.add_cline(lstart, lend, @@stipplex)
          @lines.push(e)
        elsif e.class == Sketchup::ConstructionLine
          if e.start && e.end
            lstart = e.start.position
            lend = e.end.position
            if @endpoints
              @ents.add_cpoint lstart
              @ents.add_cpoint lend
            end
            @ents.add_edges(lstart, lend)
            @ents[-1].material = @@colorx.to_s
            @ents[-1].find_faces
            @lines.push(e)
          end
        end # e.class
      end # for e
      if !@lines.empty?
        @lines.each do |e|
          e.erase! if e.valid?
        end
      end
    elsif @change
      for e in @sel
        if e.class == Sketchup::ConstructionLine
          e.stipple = @@stipplex
          if e.start && e.end
            lstart = e.start.position
            lend = e.end.position
            if @endpoints
              @ents.add_cpoint lstart
              @ents.add_cpoint lend
            end
          end
        elsif e.class == Sketchup::Edge
          lstart = e.start.position
          lend = e.end.position
          if @endpoints
            @ents.add_cpoint lstart
            @ents.add_cpoint lend
          end
          e.material = @@colorx.to_s
        end # e.class
        view.invalidate
      end # for e
    end # @change
    @sel.clear
    @model.commit_operation
  end

  def self.xLine_validate_selection_edge
    Sketchup.active_model.selection.each {|e| return true if e.class == Sketchup::Edge}
    return nil
  end

  def self.xLine_validate_selection_xline
    Sketchup.active_model.selection.each {|e| return true if (e.class == Sketchup::ConstructionLine && e.start && e.end)}
    return nil
  end

  def onKeyDown(key, repeat, flags, view)
    if key == VK_COMMAND  ### Cmd toggles stipples and change
      @change = !@change
    end

    if key == VK_ALT ### Alt toggles end points
      @endpoints = !@endpoints
    end
    show_status
  end

  def onLButtonDown(flags, x, y, view)
    ph = view.pick_helper
    ph.do_pick(x, y)
    best = ph.best_picked
    @sel.add(best) if best
    conversion
  end

  def onRButtonDown(flags, x, y, view)
    cflag = true if @@colorx == "Black"
    list = ["-|.|-.-|_", @colorlist]
    prompt = ["XLine Stipple: ", "Color: "]
    values = [@@stipplex, @@colorx]
    result = inputbox(prompt, values, list, "Change Parameters")
    if result
      @@stipplex = result[0].to_s
      @@colorx = result[1].to_s
      if cflag && @model.rendering_options["EdgeColorMode"] != 0
        choice = UI.messagebox "The edges color will only be visible if you switch to \"display color by material\". Do you want to do this at this time?", MB_YESNOCANCEL
        case choice
        when 6
          @model.rendering_options["EdgeColorMode"] = 0 # sets up styles for Color By material
          cflag = false
        when 7
          cflag = false
        end
      end # if cflag
    end # if result
    show_status
    conversion
  end

  def deactivate(view)
    Sketchup.set_status_text("", SB_PROMPT)
    Sketchup.set_status_text("", SB_VCB_LABEL)
    Sketchup.set_status_text("", SB_VCB_VALUE)
  end
end

if !file_loaded?("XLinem.rb")
  UI.add_context_menu_handler do |menu|
    if XLinemTool.xLine_validate_selection_edge
      menu.add_separator
      menu.add_item("Convert to XLine") {Sketchup.active_model.select_tool(XLinemTool.new)}
    elsif XLinemTool.xLine_validate_selection_xline
      menu.add_separator
      menu.add_item("Convert to Edge") {Sketchup.active_model.select_tool(XLinemTool.new)}
    end
  end
end

unless file_loaded?(__FILE__)
  cmd = UI::Command.new("xlinem Convert") {Sketchup.active_model.select_tool(XLinemTool.new)}
  cmd.small_icon = File.join(File.dirname(__FILE__), "Xlinem", "Xline_SM.png")
  cmd.large_icon = File.join(File.dirname(__FILE__), "Xlinem", "Xline_LG.png")
  cmd.tooltip = "Construction Line Conversion"
  tb = UI.toolbar("Line Conversion") # Fixed string termination
  tb.add_item(cmd)
  tb.restore
end```

Thanks for the plugin!!!, it doesn’t work in sketchup 2024, you can fix it