Hey Pete, welcome the community.
Here is the link to the latest version 22.2. I have actually made a ton of updates and improvements, including showing uncategorized items, Ability to group by Account, Group, Favorite. Better Insights on the Left Insight Pane and in each section. Ability to automatically see the difference between envelope balances and actual bank accounts. And a fresh look for a fresh year.
Below is a free link for existing Tiller folks. Or heck feel free to drop a donation. It is your call.
I would recommend just taking the full sheet and start from scratch with it, instead of trying to integrate into exiting Tiller sheets.
Good Luck, if you need anything please reach out.
Ultimate Envelopes v22.2 - Updated for 2022 (gumroad.com)
After you order the free sheet, you will get an email sent to you with the Google Sheet Link. It should than prompt you to make a copy of the sheet. All of the permissions happen automatically but it may take a minute or two for this to process.