else
{
    var chkbox = document.getElementById("chkbox"+i);
    var lbl = document.getElementById('lbl'+i);

    if (chkbox==null)
        return;
    if (forc[i]!=null && forc[i]=='yes')       //<------------add this line
        return;                                //<------------add this line
    chkbox.checked=false;
    lbl.className='txt';
    tabs++;
    uncheckChildren(i);
    if (DisableOnDepsNotMet)
        disableChildren(i);
    if (useExclusions)
        checkExclusions(i);
    tabs--;
}

if (isCategory(thisChk)) //If category checkbox was checked
{
    thisCat = thisChk;
    
    for(i=1; cat[i] != null; i++)
    {
        if (cat[i] == thisCat)
        {
            if (state)
            {
                setChecked(i);
                checkDeps(i);
            }
            else
            {
//                setUnchecked(i);            //<--------remove the "//" at the begining
                checkDeps(i);
            }
        }
    }
}