$(document).ready(function() {
  var default_os;
  if (bowser.windows)
    default_os = 'windows'
  else if (bowser.mac)
    default_os = 'macos'
  else
    default_os = 'linux'

  var defaults = {
    version: '1.2',
    channel: 'stable',
    os: default_os,
    method: 'multiwerf'
  }

  function installSelect(group, param) {
    $(`[data-install-tab-group="${group}"]`).removeClass('active');
    $(`[data-install-tab="${param}"]`).addClass('active');

    $(`[data-install-content-group="${group}"]`).removeClass('active');
    $(`[data-install-content="${param}"]`).addClass('active');

    $(`[data-install-info="${group}"]`).text($(`[data-install-tab="${param}"]`).text());
  }

  $('[data-install-tab]').on('click', function() {
    installSelect($(this).data('install-tab-group'), $(this).data('install-tab'));
  })

  Object.keys(defaults).forEach(function(key) {
    installSelect(key, defaults[key]);
  });
})

@@ -229,14 +229,13 @@
 l: '
-stable
+alpha
 ',%0A 
@@ -293,17 +293,19 @@
 unction 
-i
+doI
 nstallSe
@@ -581,32 +581,32 @@
 ass('active');%0A%0A
-
     $(%60%5Bdata-ins
@@ -683,16 +683,674 @@
 );%0A  %7D%0A%0A
+  function installSelect(group, param) %7B%0A    if (group == %22version%22 && param == %221.2%22) %7B%0A        $(%60%5Bdata-install-tab=%22rock-solid%22%5D%60).hide();%0A        $(%60%5Bdata-install-tab=%22stable%22%5D%60).hide();%0A        $(%60%5Bdata-install-tab=%22ea%22%5D%60).hide();%0A        $(%60%5Bdata-install-tab=%22beta%22%5D%60).hide();%0A%0A        doInstallSelect(group, param)%0A        doInstallSelect(%22channel%22, %22alpha%22)%0A        return%0A    %7D else if (group == %22version%22) %7B%0A        $(%60%5Bdata-install-tab=%22rock-solid%22%5D%60).show();%0A        $(%60%5Bdata-install-tab=%22stable%22%5D%60).show();%0A        $(%60%5Bdata-install-tab=%22ea%22%5D%60).show();%0A        $(%60%5Bdata-install-tab=%22beta%22%5D%60).show();%0A    %7D%0A%0A    doInstallSelect(group, param)%0A  %7D%0A%0A
   $('%5Bda

Fix installation page: show v1.2 + alpha channel only