After refreshing a sandbox last night, I was unable to retrieve metadata from the org using SFDX in VSCode due to a mismatch in API Versions. The error received was:
15:51:26.514 Starting SFDX: Retrieve Source from Org
UNSUPPORTED_API_VERSION: Invalid Api version specified on URL
After some digging, I combined a few almost decade old SE and Trailblazer community answers to fix it. At first I just reset the API Version to 60.0, but then I received the following:
16:00:54.755 Starting SFDX: Retrieve Source from Org
16:00:59.767 ended SFDX: Retrieve Source from Org
with no specified error, just that the retrieval was failing according to the VSCode popup. Solution in first comment in case anyone else runs into the same issue.