diff --git a/docs/3.x.x/en/migration/migration-guide-alpha-11-to-alpha-12.md b/docs/3.x.x/en/migration/migration-guide-alpha-11-to-alpha-12.md
new file mode 100644
index 0000000000..01c30b6875
--- /dev/null
+++ b/docs/3.x.x/en/migration/migration-guide-alpha-11-to-alpha-12.md
@@ -0,0 +1,96 @@
+# Migrating from 3.0.0-alpha.11 to 3.0.0-alpha.12
+
+This migration guide is a mix of migrations from 3.0.0-alpha.11.1 to 3.0.0-alpha.11.2, 3.0.0-alpha.11.2 to 3.0.0-alpha.11.3 and from 3.0.0-alpha.11.3 to 3.0.0-alpha.12.
+
+> Feel free to [join us on Slack](http://slack.strapi.io) and ask questions about the migration process.
+
+
+## Getting started
+
+Install Strapi `alpha.12` globally on your computer. To do so run `npm install strapi@3.0.0-alpha.12 -g`.
+
+When it's done, generate a new empty project `strapi new myNewProject` (don't pay attention to the database configuration).
+
+## Configurations
+
+You will have to update just 1 file: `package.json`
+
+- Edit the Strapi's dependencies version: (move Strapi's dependencies to `3.0.0-alpha.12` version) in `package.json` file
+
+```json
+{
+  "dependencies": {
+    "lodash": "4.x.x",
+    "strapi": "3.0.0-alpha.12",
+    "strapi-mongoose": "3.0.0-alpha.12"
+  }
+}
+```
+
+
+## Update the Admin
+
+Delete your old admin folder and replace it by the new one.
+
+
+## Update the Plugins
+
+Copy the fields and relations you had in your `/plugins/users-permissions/models/User.settings.json` file in the new one.
+
+Then, delete your old `plugins` folder and replace it by the new one.
+
+## Update roles
+
+> This update is if you come from version before alpha-11.2
+
+Update `type` of `Guest` role to `public` in your database. You can also update name and description:
+
+```json
+{
+  "name": "Public",
+  "description": "Default role given to unauthenticated user.",
+  "type": "public"
+}
+```
+
+Create Authenticated role:
+
+```json
+{
+  "name": "Authenticated",
+  "description": "Default role given to authenticated user.",
+  "type": "authenticated"
+}
+```
+
+In `Users & Permissions > Advanced`  in admin panel update default role to `Authenticated`
+
+You also will have to reset your roles permissions.
+
+### Update bookshelf filters
+
+> This update is if you come from version before alpha-11.3
+
+You will have to replace your `fetchAll` services queries of your generated API:
+
+```js
+_.forEach(convertedParams.where, (where, key) => {
+   if (_.isArray(where.value)) {
+     for (const value in where.value) {
+       qb[value ? 'where' : 'orWhere'](key, where.symbol, where.value[value])
+     }
+   } else {
+     qb.where(key, where.symbol, where.value);
+   }
+ });
+
+ if (convertedParams.sort) {
+   qb.orderBy(convertedParams.sort.key, convertedParams.sort.order);
+ }
+
+ qb.offset(convertedParams.start);
+
+ qb.limit(convertedParams.limit);
+```
+
+That's all, you have now upgraded to Strapi `alpha.12`.
diff --git a/packages/strapi-admin/controllers/Admin.js b/packages/strapi-admin/controllers/Admin.js
index 18fbfc9c37..af07830494 100755
--- a/packages/strapi-admin/controllers/Admin.js
+++ b/packages/strapi-admin/controllers/Admin.js
@@ -54,7 +54,7 @@ module.exports = {
 
       strapi.log.info(`Installing ${plugin}...`);
 
-      exec(`node ${strapiBin} install ${plugin} ${port === '4000' ? '--dev' : ''}`);
+      exec(`node "${strapiBin}" install ${plugin} ${port === '4000' ? '--dev' : ''}`);
 
       ctx.send({ ok: true });
 
@@ -87,7 +87,7 @@ module.exports = {
       strapi.reload.isWatching = false;
 
       strapi.log.info(`Uninstalling ${plugin}...`);
-      exec(`node ${strapiBin} uninstall ${plugin}`);
+      exec(`node "${strapiBin}" uninstall ${plugin}`);
 
       ctx.send({ ok: true });
 
diff --git a/packages/strapi/lib/utils/post-install.js b/packages/strapi/lib/utils/post-install.js
index 8ae028e299..d6697da4a2 100644
--- a/packages/strapi/lib/utils/post-install.js
+++ b/packages/strapi/lib/utils/post-install.js
@@ -24,7 +24,7 @@ try {
   // Check if path is existing.
   fs.accessSync(adminDirPath, fs.constants.R_OK | fs.constants.W_OK);
 
-  const install = exec(`cd ${adminDirPath} && npm install --prod --ignore-scripts`, {
+  const install = exec(`cd "${adminDirPath}" && npm install --prod --ignore-scripts`, {
     silent: true
   });
 
@@ -35,8 +35,8 @@ try {
 
   console.log('✅  Success');
   console.log('');
-} catch (err) {
-  if (err.code === 'ENOENT') {
+} catch (e) {
+  if (e.code === 'ENOENT') {
     console.log('✅  Success');
     console.log('');
 
@@ -60,7 +60,7 @@ try {
     console.log('📦  Installing packages...');
 
     try {
-      const install = exec(`cd ${pluginPath} && npm install --prod --ignore-scripts`, {
+      const install = exec(`cd "${pluginPath}" && npm install --prod --ignore-scripts`, {
         silent: true
       });
 
@@ -76,7 +76,7 @@ try {
     }
   });
 } catch (e) {
-  if (err.code === 'ENOENT') {
+  if (e.code === 'ENOENT') {
     console.log('✅  Success');
     console.log('');