Updated readme with upgrade instructions (#110)

README.md

@@ -2,7 +2,7 @@
 
 A paid-members publication for Ghost. Can be used with no code knowledge required.
 
-# Instructions
+# Installation instructions
 
 1. [Download this theme](https://github.com/TryGhost/Lyra/archive/main.zip)
 2. Log into Ghost, and go to the `Design` settings area to upload the zip file
@@ -12,8 +12,20 @@ A paid-members publication for Ghost. Can be used with no code knowledge require
 
 That's it! You now have a Ghost publication which supports free and paid memberships. If you need help, check out the <a href="https://ghost.org/docs/members/">Ghost members documentation</a> or chat with other Ghost users on <a href="https://forum.ghost.org">Ghost forum</a>.
 
-![screenshot](https://user-images.githubusercontent.com/120485/67228748-1fdd1400-f464-11e9-921f-ecbf5f412ed5.png)
+![Screenshot of a subscribers only post](https://user-images.githubusercontent.com/120485/67228748-1fdd1400-f464-11e9-921f-ecbf5f412ed5.png)
 
+# Upgrade instructions
+
+1. [Download this theme](https://github.com/TryGhost/Lyra/archive/refs/heads/main.zip) and rename the zip for ease of identification in Ghost later.  For example `2022-10-20_Lyra-main.zip`
+2. Log into Ghost, 4. go to the `Labs` settings area and scroll down until you see the `Routes` section
+3. Download your current `routes.yaml` file 
+4. Next go to the `Design` settings area and click `Change Theme` at the bottom of the navigation pane
+5. Click the `Upload theme` button in the top right and upload the zip file you downloaded and renamed earlier (for example `2022-10-20_Lyra-main.zip`)
+6. You will now see two instances of Lyra similar to the screenshot below
+    ![Themes list showing two copies of Lyra](docs/TwoLyraInstances.png)
+7. Ensure your new Lyra theme is active (based on the renamed zip from earlier, `lyra (2020-10-31_Lyra-main)` in the screenshot)
+8. Delete the previous Lyra theme (`lyra (Lyra-master)` in the screenshot)
+9Upload `routes.yaml` as required (see _Installation instructions_ above)
 
 # Development