update link to download tb68

pages/mydoc/PGP_Encrypted_Email_Mac.md

@@ -81,22 +81,19 @@ Download and Install Thunderbird
 
 Thunderbird is an email client that can be used to download and send email, and that you can use together with an add-on called Enigmail to encrypt your email.
 
-1. Visit [Thunderbird's website](https://www.thunderbird.net/) to download Thunderbird.
+Recently thunderbird released the version 78 which is not stable enough for us, so we recommend to use thunderbird version 68, see link below
 
-2. Click the green "Free Download" button.
-  
-    ![](images/mac/macPgpThunderbirdDownload.png)
+1. Click here and Download [Thunderbird 68 (stable version) for OSX](https://download.mozilla.org/?product=thunderbird-68.10.0-SSL&os=osx&lang=en-US) 
 
-3. When prompted, check "Save File" and click "OK".
+2. When prompted, check "Save File" and click "OK".
 
     ![](images/mac/macPgpThunderbirdDownloadSave.png)
 
-4. Click the download arrow in the top right of your browser, then click the Thunderbird .dmg file in your recent downloads.
+3. Click the download arrow in the top right of your browser, then click the Thunderbird .dmg file in your recent downloads.
 
-    ![](images/mac/macPgpDownloadThunderbirdArrow1.png)
     ![](images/mac/macPgpDownloadThunderbirdArrow2.png)
 
-5. When prompted, drag the Thunderbird icon into your Applications folder.
+4. When prompted, drag the Thunderbird icon into your Applications folder.
 
     ![](images/mac/macPgpDragDropThunderbirdToApplications.png)