title: flutter downgrade error - There is no previously recorded version for channel
body: <p>My project uses packages that are not backward compatible,</p>
  <p>I tired to install on a new PC but it install the latest flutter and I cannot downgrade flutter</p>
  <pre><code>$ flutter downgrade v1.22.6
  Downloading Dart SDK from Flutter engine a252ec09b74cca0f8d8d3450566bf77c77f81e8d...
    % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                   Dload  Upload   Total   Spent    Left  Speed
  100  199M  100  199M    0     0  1159k      0  0:02:55  0:02:55 --:--:-- 2695k
  Building flutter tool...
  Downloading Material fonts...                                    1,453ms
  Downloading Gradle Wrapper...                                      242ms
  Downloading package sky_engine...                                  914ms
  Downloading flutter_patched_sdk tools...                            4.8s
  Downloading flutter_patched_sdk_product tools...                    3.9s
  Downloading linux-x64 tools...                                      7.3s
  Downloading linux-x64/font-subset tools...                         874ms
  There is no previously recorded version for channel &quot;dev&quot;.
  </code></pre>
  <p>I tried on <code>stable</code> and <code>beta</code> as well</p>
  <pre><code>$ flutter downgrade v1.22.6
  There is no previously recorded version for channel &quot;stable&quot;.
  
  flutter downgrade 1.22.6
  There is no previously recorded version for channel &quot;beta&quot;.
  </code></pre>
  <p>I also tried:</p>
  <pre><code>$ flutter version v1.22.6
  WARNING: Flutter version command has been removed, using latest from channel
  </code></pre>