Try restoring the QBB file on a trial license
https://quickbooks.intuit.com/learn-support/en-ca/getting-started/download-a-trial-of-quickbooks-des...
Then you may migrate to QBO from there.
https://quickbooks.grsm.io/Canada
If your QBB version is too old, you need to call and ask Intuit Data Service to convert it and get a QBW file to open on 2020 version. Should you need to resolve it in due course, consider purchasing a 3rd party conversion service.
Hope it helps.