Photoshop Paths to Alpha Channel

The script goes through the motions but the make alpha channels fails to materialize. So I changed the the Action manger code that is use to make the alpha channel. All versions of Photoshop then create alpha channels with a selection, However, CC 2017 Alpha channels were the inverses of what the should be.  So I added a test for Photoshop and if above CC 2015.5 through in an invert selection.  So the script no work with all the version of Photoshop I now have installed. Who know what tomorrow will bring? All versions of Photoshop have bugs.  What will Adobe give us next.

#target photoshop  
var doc = activeDocument;  
setColors ();  
for(var i=0;i<doc.pathItems.length;i++){  
    doc.pathItems.select(); 
    makeSelection (); 
    //makeChannel (); 
  n = i+1;
    saveAlpha("Alpha " + n);
}  
selRGB ();  
doc.selection.deselect();  
  
function selRGB(){  
    var idslct = charIDToTypeID( "slct" );  
        var desc10 = new ActionDescriptor();  
        var idnull = charIDToTypeID( "null" );  
            var ref5 = new ActionReference();  
            var idChnl = charIDToTypeID( "Chnl" );  
            var idChnl = charIDToTypeID( "Chnl" );  
            var idRGB = charIDToTypeID( "RGB " );  
            ref5.putEnumerated( idChnl, idChnl, idRGB );  
        desc10.putReference( idnull, ref5 );  
    executeAction( idslct, desc10, DialogModes.NO );  
      
    }  
  
function setColors(){  
    var idRset = charIDToTypeID( "Rset" );  
        var desc3 = new ActionDescriptor();  
        var idnull = charIDToTypeID( "null" );  
            var ref3 = new ActionReference();  
            var idClr = charIDToTypeID( "Clr " );  
            var idClrs = charIDToTypeID( "Clrs" );  
            ref3.putProperty( idClr, idClrs );  
        desc3.putReference( idnull, ref3 );  
    executeAction( idRset, desc3, DialogModes.NO );    
    }  
  
function makeChannel(){  
    var idMk = charIDToTypeID( "Mk  " );  
        var desc4 = new ActionDescriptor();  
        var idNw = charIDToTypeID( "Nw  " );  
            var desc5 = new ActionDescriptor();  
            var idClrI = charIDToTypeID( "ClrI" );  
            var idMskI = charIDToTypeID( "MskI" );  
            var idMskA = charIDToTypeID( "MskA" );  
            desc5.putEnumerated( idClrI, idMskI, idMskA );  
            var idClr = charIDToTypeID( "Clr " );  
                var desc6 = new ActionDescriptor();  
                var idRd = charIDToTypeID( "Rd  " );  
                desc6.putDouble( idRd, 255.000000 );  
                var idGrn = charIDToTypeID( "Grn " );  
                desc6.putDouble( idGrn, 0.000000 );  
                var idBl = charIDToTypeID( "Bl  " );  
                desc6.putDouble( idBl, 0.000000 );  
            var idRGBC = charIDToTypeID( "RGBC" );  
            desc5.putObject( idClr, idRGBC, desc6 );  
            var idOpct = charIDToTypeID( "Opct" );  
            desc5.putInteger( idOpct, 50 );  
        var idChnl = charIDToTypeID( "Chnl" );  
        desc4.putObject( idNw, idChnl, desc5 );  
    executeAction( idMk, desc4, DialogModes.NO );  
  
    // =======================================================  
    var idFl = charIDToTypeID( "Fl  " );  
        var desc7 = new ActionDescriptor();  
        var idUsng = charIDToTypeID( "Usng" );  
        var idFlCn = charIDToTypeID( "FlCn" );  
        var idBckC = charIDToTypeID( "BckC" );  
        desc7.putEnumerated( idUsng, idFlCn, idBckC );  
        var idOpct = charIDToTypeID( "Opct" );  
        var idPrc = charIDToTypeID( "#Prc" );  
        desc7.putUnitDouble( idOpct, idPrc, 100.000000 );  
        var idMd = charIDToTypeID( "Md  " );  
        var idBlnM = charIDToTypeID( "BlnM" );  
        var idNrml = charIDToTypeID( "Nrml" );  
        desc7.putEnumerated( idMd, idBlnM, idNrml );  
    executeAction( idFl, desc7, DialogModes.NO );  
      
    }  
  
function makeSelection(){  
   var idsetd = charIDToTypeID( "setd" );  
        var desc12 = new ActionDescriptor();  
        var idnull = charIDToTypeID( "null" );  
            var ref6 = new ActionReference();  
            var idChnl = charIDToTypeID( "Chnl" );  
            var idfsel = charIDToTypeID( "fsel" );  
            ref6.putProperty( idChnl, idfsel );  
        desc12.putReference( idnull, ref6 );  
        var idT = charIDToTypeID( "T   " );  
            var ref7 = new ActionReference();  
            var idPath = charIDToTypeID( "Path" );  
            var idOrdn = charIDToTypeID( "Ordn" );  
            var idTrgt = charIDToTypeID( "Trgt" );  
            ref7.putEnumerated( idPath, idOrdn, idTrgt );  
        desc12.putReference( idT, ref7 );  
        var idVrsn = charIDToTypeID( "Vrsn" );  
        desc12.putInteger( idVrsn, 1 );  
        var idvectorMaskParams = stringIDToTypeID( "vectorMaskParams" );  
        desc12.putBoolean( idvectorMaskParams, true );  
    executeAction( idsetd, desc12, DialogModes.NO );  
    }  
function  saveAlpha(alphaName){
  var numberArray = version.split(".");
  if ( numberArray[0] > 17 ) {
  var idInvs = charIDToTypeID( "Invs" );
  executeAction( idInvs, undefined, DialogModes.NO );
  }
  var idDplc = charIDToTypeID( "Dplc" );
     var desc27 = new ActionDescriptor();
    var idnull = charIDToTypeID( "null" );
         var ref11 = new ActionReference();
         var idChnl = charIDToTypeID( "Chnl" );
         var idfsel = charIDToTypeID( "fsel" );
         ref11.putProperty( idChnl, idfsel );
     desc27.putReference( idnull, ref11 );
     var idNm = charIDToTypeID( "Nm  " );
     desc27.putString( idNm, alphaName );
  try {
  executeAction( idDplc, desc27, DialogModes.NO );
  }
  catch(e) {}
}