One way to contact HR Block support without calling them is by messaging their Twitter/X support account @HRBlockAnswers.
HR Block only lists phone numbers on their website for contacting customer support:
“For general support, contact your tax office or our client service team.”
If you lost your old installation file or download link, you can get a free replacement download link from HR Block's Twitter/X support account @HRBlockAnswers, as long as you have the email and billing address info from your purchase of HR Block software.
For 2021 I needed to request both a federal download link and another download link for the state in which I filed, before I was able to open my old return file.
You may need to download the additional state and federal updates, after installing, from: https://www.hrblock.com/tax-software/updates-back-editions/prior-year/