Add instructions for upgrading scubagoggles (#433)

* Update Troubleshooting.md with upgrading instructions

* Update DownloadAndInstall.md with link to troubleshooting

* Update README.md

* Update README.md with new upgrading section

* Rework documentation for new upgrading section

README.md

@@ -56,6 +56,10 @@ The majority of the conformance checks done by ScubaGoggles rely on [GWS Admin l
 - [Reviewing Output](/docs/usage/ReviewOutput.md)
 - [Limitations](/docs/usage/Limitations.md)
 
+### Upgrading and Maintenance
+- [Upgrading ScubaGoggles](/docs/upgrading/Upgrading.md#upgrading-scubagoggles)
+- [Upgrading OPA](/docs/upgrading/Upgrading.md#upgrading-opa)
+
 ### Troubleshooting
 - [Lots of Manual Checks](/docs/troubleshooting/Troubleshooting.md#lots-of-manual-checks)
 - [Not Authorized to Access This Resource](/docs/troubleshooting/Troubleshooting.md#not-authorized-to-access-this-resource)

docs/installation/DownloadAndInstall.md

@@ -1,4 +1,6 @@
 # Download and Python Install
+> [!NOTE]
+> Previously installed a different version of ScubaGoggles? See [Upgrading ScubaGoggles](/docs/upgrading/Upgrading.md#upgrading-scubagoggles).
 
 ## Downloading the Latest Release
 To download ScubaGoggles:

docs/upgrading/Upgrading.md

@@ -0,0 +1,22 @@
+# Upgrading and Maintenance
+
+## Upgrading ScubaGoggles
+Assuming you installed ScubaGoggles as described in [Download and Install](/docs/installation/DownloadAndInstall.md), upgrading to the lastest version of ScubaGoggles should be as simple as:
+- Repeating the steps described in [Download and Install](/docs/installation/DownloadAndInstall.md) with the new release.
+- Making the OPA executable available, by either:
+    - downloading the executable again as described in [Download the OPA executable](/docs/installation/OPA.md),
+    - copying the executable from the old release folder to the new release folder, or
+    - using the `--opapath` parameter to tell ScubaGoggles where to look for the executable.
+- Making your credentials available, by either:
+    - copying your `credentials.json` file to the new release folder or
+    - using the `--credentials` parameter to tell ScubaGoggles where to look for your credentials.
+
+If instead you cloned the ScubaGoggles repo and wish to run ScubaGoggles on the latest code from main (only recommended for development purposes), be sure to run `python -m pip install .` inside the ScubaGoggles directory after pulling the latest code.
+
+## Upgrading OPA
+While new versions of OPA are periodically released, it is only necessary to upgrade OPA if the version you have locally is unsupported. Running `python download_opa.py --help` lists the supported OPA versions.
+
+Upgrading OPA is as simple as downloading the desired executable, which can be done by running the `download_opa.py` script again. See [Download the OPA executable](/docs/installation/OPA.md) for detailed instructions.
+
+## Navigation
+- Return to [Documentation Home](/README.md)