Answers.Body: <p>I had the same problem following that video, i assume the ReleaseCandidate upgrade differs from the beta upgrade. Following the instructions from the craftcms github repo worked for me. <a href="https://docs.craftcms.com/v3/upgrade.html" rel="nofollow noreferrer">https://docs.craftcms.com/v3/upgrade.html</a></p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-01-10T20:56:05.467Z
Answers.Text: Thanks Karl. That did the trick for me as well.
Answers.UserDisplayName: Jon Livingston
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-07-23T01:03:21.177Z
Answers.Text: instruction doesn't exist anymore
Answers.UserDisplayName: Nikolay Bronskiy
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-07-24T13:44:52.703Z
Answers.Text: Now that craft 3 is released you should use https://docs.craftcms.com/v3/upgrade.html to upgrade from v2 to v3.
Answers.UserDisplayName: karl
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-01-09T20:17:11.317Z
Answers.LastActivityDate: 2018-11-02T18:42:46.647Z
Answers.LastEditDate: 2018-11-02T18:42:46.647Z
Answers.UserDisplayName: karl
Body: <p>I have installed composer successfully but when I try to add:</p>
  
  <pre><code>composer require craftcms/plugin-installer
  </code></pre>
  
  <p>I get the following:</p>
  
  <pre><code>Your requirements could not be resolved to an installable set of packages.
  
  Problem 1
  - craftcms/cms 3.0.0-RC4 requires craftcms/plugin-installer ~1.5.0 -&gt; satisfiable by craftcms/plugin-installer[1.5.0, 1.5.1, 1.5.2] but these conflict with your requirements or minimum-stability.
  - craftcms/cms 3.0.0-RC4 requires craftcms/plugin-installer ~1.5.0 -&gt; satisfiable by craftcms/plugin-installer[1.5.0, 1.5.1, 1.5.2] but these conflict with your requirements or minimum-stability.
  - craftcms/cms 3.0.0-RC4 requires craftcms/plugin-installer ~1.5.0 -&gt; satisfiable by craftcms/plugin-installer[1.5.0, 1.5.1, 1.5.2] but these conflict with your requirements or minimum-stability.
  - Installation request for craftcms/cms 3.0.0-RC4 -&gt; satisfiable by craftcms/cms[3.0.0-RC4].
  
  Installation failed, reverting ./composer.json to its original content.
  </code></pre>
  
  <p>I have also tried the following with no luck:</p>
  
  <pre><code>composer require craftcms/plugin-installer --ignore-platform-regs
  </code></pre>
  
  <p>Note my composer.json file shows the following:</p>
  
  <pre><code>{
  
  "minimum-stability": "dev",
  "repositories": [
      {
          "type": "composer",
          "url": "https://asset-packagist.org"
      }
  ],
  "config": {
      "optimize-autoloader": true,
      "platform":{
          "php":"7.1.1"
      }
  },
  "require": {
      "craftcms/cms": "3.0.0-RC4"
  }
  }
  </code></pre>
  
  <p>Any help would be appreciated! On a side note this is a local install using Mamp Pro.</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2018-01-03T02:34:02.907Z
Comments.Text: Is there a reason you're manually doing `composer require craftcms/plugin-installer`?  `craftcms/cms` requires it directly and https://github.com/craftcms/docs/blob/master/en/installation.md#2-create-a-new-craft-project pulls it in for you.
Comments.UserDisplayName: Brad Bell
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2018-01-05T19:31:12.427Z
Comments.Text: Something I unfortunately forgot to mention is that I'm upgrading from Craft 2 to Craft 3. I was following Mijingo's "Upgrade Craft 2 to 3" video and I can't get past the require craftcms/plugin-installer command.
Comments.UserDisplayName: Jon Livingston
Tags: <craft3><composer>
Title: Composer conflict when installing craftcms/plugin-installer
ThreadText: # Composer conflict when installing craftcms/plugin-installer
  
  (Asked by: username_0 on 2018-01-03)
  
  I have installed composer successfully but when I try to add:
  
  ```
  composer require craftcms/plugin-installer
  
  ```
  
  I get the following:
  
  ```
  Your requirements could not be resolved to an installable set of packages.
  
  Problem 1
  - craftcms/cms 3.0.0-RC4 requires craftcms/plugin-installer ~1.5.0 -> satisfiable by craftcms/plugin-installer[1.5.0, 1.5.1, 1.5.2] but these conflict with your requirements or minimum-stability.
  - craftcms/cms 3.0.0-RC4 requires craftcms/plugin-installer ~1.5.0 -> satisfiable by craftcms/plugin-installer[1.5.0, 1.5.1, 1.5.2] but these conflict with your requirements or minimum-stability.
  - craftcms/cms 3.0.0-RC4 requires craftcms/plugin-installer ~1.5.0 -> satisfiable by craftcms/plugin-installer[1.5.0, 1.5.1, 1.5.2] but these conflict with your requirements or minimum-stability.
  - Installation request for craftcms/cms 3.0.0-RC4 -> satisfiable by craftcms/cms[3.0.0-RC4].
  
  Installation failed, reverting ./composer.json to its original content.
  
  ```
  
  I have also tried the following with no luck:
  
  ```
  composer require craftcms/plugin-installer --ignore-platform-regs
  
  ```
  
  Note my composer.json file shows the following:
  
  ```
  {
  
  "minimum-stability": "dev",
  "repositories": [
      {
          "type": "composer",
          "url": "https://asset-packagist.org"
      }
  ],
  "config": {
      "optimize-autoloader": true,
      "platform":{
          "php":"7.1.1"
      }
  },
  "require": {
      "craftcms/cms": "3.0.0-RC4"
  }
  }
  
  ```
  
  Any help would be appreciated! On a side note this is a local install using Mamp Pro.
  
  **Tags:** craft3, composer
  
  > **Comments:**
  > **username_1**: Is there a reason you're manually doing `composer require craftcms/plugin-installer`?  `craftcms/cms` requires it directly and https://github.com/craftcms/docs/blob/master/en/installation.md#2-create-a-new-craft-project pulls it in for you.  
  > **username_0**: Something I unfortunately forgot to mention is that I'm upgrading from Craft 2 to Craft 3. I was following Mijingo's "Upgrade Craft 2 to 3" video and I can't get past the require craftcms/plugin-installer command.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_2 on 2018-01-09. Score: 2 | Accepted answer
  
  I had the same problem following that video, i assume the ReleaseCandidate upgrade differs from the beta upgrade. Following the instructions from the craftcms github repo worked for me. <https://docs.craftcms.com/v3/upgrade.html>
  
  > **Comments:**
  > **username_0**: Thanks username_2. That did the trick for me as well.  
  > **username_3**: instruction doesn't exist anymore  
  > **username_2**: Now that craft 3 is released you should use https://docs.craftcms.com/v3/upgrade.html to upgrade from v2 to v3.  
  
  ---
  
  