diff --git a/dependencies.list b/dependencies.list
index 4e019f61..1fdb2268 100644
--- a/dependencies.list
+++ b/dependencies.list
@@ -1,5 +1,5 @@
 PACKAGE_NAME=realm-js
 VERSION=1.8.3
-REALM_CORE_VERSION=3.0.0-rc2
-REALM_SYNC_VERSION=2.0.0-rc10
+REALM_CORE_VERSION=3.0.0-rc3
+REALM_SYNC_VERSION=2.0.0-rc11
 REALM_OBJECT_SERVER_VERSION=2.0.0-alpha9
diff --git a/package.json b/package.json
index 04d5d1b3..f5a52dd9 100644
--- a/package.json
+++ b/package.json
@@ -78,11 +78,12 @@
     "check-environment": "node scripts/check-environment.js"
   },
   "dependencies": {
-    "extract-zip": "^1.6.0",
+    "command-line-args": "^4.0.6",
+    "decompress": "^4.2.0",
     "ini": "^1.3.4",
     "nan": "^2.3.3",
     "node-fetch": "^1.6.3",
-    "node-pre-gyp": "^0.6.30",
+    "node-pre-gyp": "^0.6.36",
     "request": "^2.78.0",
     "sync-request": "^3.0.1",
     "url-parse": "^1.1.7"
diff --git a/realm.gypi b/realm.gypi
index cb49897d..4ee0960a 100644
--- a/realm.gypi
+++ b/realm.gypi
@@ -116,27 +116,13 @@
           "<(module_root_dir)/vendor/realm-node/osx"
         ]
       },
-      "conditions": [
-        ["realm_download_binaries and OS=='win'", {
-          "actions": [
-            {
-              "action_name": "download-realm",
-              "inputs": [ "<(module_root_dir)/scripts/download-realm.js" ],
-              "outputs": [ "<(module_root_dir)/vendor/realm-node" ],
-              "action": [ "node", "<(module_root_dir)/scripts/download-realm.js", "node", "<(use_realm_debug)" ]
-            }
-          ]
-        }],
-        ["realm_download_binaries and OS!='win'", {
-          "actions": [
-            {
-              "action_name": "download-realm",
-              "inputs": [ ],
-              "outputs": [ "<(module_root_dir)/vendor/realm-node" ],
-              "action": [ "<(module_root_dir)/scripts/download-core.sh", "node", "<(realm_enable_sync)" ]
-            }
-          ]
-        }]
+      "actions": [
+        {
+          "action_name": "download-realm",
+          "inputs": [ "<(module_root_dir)/scripts/download-realm.js" ],
+          "outputs": [ "<(module_root_dir)/vendor/realm-node" ],
+          "action": [ "node", "<(module_root_dir)/scripts/download-realm.js", "<(OS)", "--debug=<(use_realm_debug)", "--sync=<(realm_enable_sync)", "--arch=<(target_arch)" ]
+        }
       ]
     }
   ]
diff --git a/scripts/download-realm.js b/scripts/download-realm.js
index 5e9516a3..e128b717 100644
--- a/scripts/download-realm.js
+++ b/scripts/download-realm.js
@@ -22,46 +22,55 @@ const fs = require('fs');
 const path = require('path');
 const fetch = require('node-fetch');
 const ini = require('ini').parse;
-const unzip = require('extract-zip');
+const decompress = require('decompress');
 
 function download(url, destination) {
     return fetch(url).then((response) => {
         if (response.status !== 200) {
             throw new Error(`Error downloading ${url} - received status ${response.status} ${response.statusText}`);
-        } else if (response.headers.get('content-type') !== 'application/zip') {
-            throw new Error(`Unexpected response content type - ${response.headers.get('content-type')}`);
-        } else {
-            return new Promise((resolve) => {
-                const file = fs.createWriteStream(destination);
-                response.body.pipe(file)
-                             .on('finish', () => {
-                                 file.close(resolve);
-                             });  
-            });
         }
-    });
-}
 
-function extract(archive, destination) {
-    return new Promise((resolve, reject) => {
-        unzip(archive, { dir: destination }, (error) => {
-            if (error) {
-                reject(error);
-            } else {
-                resolve();
-            }
+        return new Promise((resolve) => {
+            const file = fs.createWriteStream(destination);
+            response.body.pipe(file)
+                         .on('finish', () => {
+                             file.close(resolve);
+                         });  
         });
     });
 }
 
+const optionDefinitions = [
+    { name: 'platform', type: String, defaultOption: true },
+    { name: 'arch', type: String },
+    { name: 'sync', type: Boolean },
+    { name: 'debug', type: Boolean },
+];
+const options = require('command-line-args')(optionDefinitions);
+
+console.log(options);
+
+let product, archive, extractedFolder;
+
 const dependencies = ini(fs.readFileSync(path.resolve(__dirname, '../dependencies.list'), 'utf8'));
-const coreArchive = `realm-core-windows-${dependencies.REALM_CORE_VERSION}.zip`;
-const coreUrl = `https://static.realm.io/downloads/core/${coreArchive}`;
+if (!options.sync) {
+    throw new Error("Downloading core is not yet supported!");
+} else {
+    product = 'sync';
+    switch (options.platform) {
+    case 'mac':
+        archive = `realm-sync-node-cocoa-${dependencies.REALM_SYNC_VERSION}.tar.gz`
+        extractedFolder = `realm-sync-node-cocoa-${dependencies.REALM_SYNC_VERSION}`
+    }
+}
+
+const url = `https://static.realm.io/downloads/${product}/${archive}`;
 const vendorDir = path.resolve(__dirname, '../vendor');
-const downloadedCoreArchive = path.resolve(vendorDir, coreArchive);
+const downloadedArchive = path.resolve(vendorDir, archive);
 const realmDir = path.resolve(vendorDir, 'realm-node');
 
 if (!fs.existsSync(realmDir)) {
-    const downloadTask = fs.existsSync(downloadedCoreArchive) ? Promise.resolve() : download(coreUrl, downloadedCoreArchive);
-    downloadTask.then(() => extract(downloadedCoreArchive, realmDir));
+    const downloadTask = fs.existsSync(downloadedArchive) ? Promise.resolve() : download(url, downloadedArchive);
+    downloadTask.then(() => decompress(downloadedArchive, vendorDir))
+                .then(() => fs.renameSync(path.resolve(vendorDir, extractedFolder), realmDir));
 }
\ No newline at end of file
diff --git a/target_defaults.gypi b/target_defaults.gypi
index e5477d9d..962f9f8f 100644
--- a/target_defaults.gypi
+++ b/target_defaults.gypi
@@ -43,16 +43,14 @@
       "Debug": {
         "msvs_settings": {
           "VCCLCompilerTool": {
-            "RuntimeTypeInfo": "true",
-            "AdditionalOptions": [ "/MDd" ]
+            "RuntimeTypeInfo": "true"
           },
         }
       },
       "Release": {
         "msvs_settings": {
           "VCCLCompilerTool": {
-            "RuntimeTypeInfo": "true",
-            "AdditionalOptions": [ "/MD" ]
+            "RuntimeTypeInfo": "true"
           },
         }
       }