Install builds from blender.org, see which of your add-ons have a newer release, file a bug straight to the developer, and open every .blend in the version that saved it.
An add-on installed from a .zip sits somewhere Blender never checks, and the store you bought it from has no way to reach you. The launcher scans every add-on under every Blender you have and lists the ones with a newer release, with a link back to the store.
Developers can publish a prerelease channel; an invite code puts one add-on on it and nothing else. The notification is a setting, not a nag.
Pick the version, pick the add-on, write what happened. The report carries the context that otherwise takes three round-trips to establish, and one button strips usernames, paths, emails and tokens out of anything you paste in.
Replies come back as a thread you can answer. Reports about the same bug are merged, so the tenth person to hit it reads the first one's answer.
Stable releases and daily builds in one list, instead of a page you have to remember to check. Installing one is a download, not an installer: it unpacks into its own folder, needs no admin rights, and leaves the Blender you already use alone.
Each download is verified against blender.org before anything is unpacked, so a file that arrived damaged is fetched again rather than half-installed.
Double-click a scene and it opens in the version that saved it, with no window in between. A folder can pin its own version, and your files keep Blender's icon.
One optional extra, if you own Clean Panels Pro. Everything else here works without it. It is a paid add-on of mine, and that link is a referral.
Its delayed loading picks which add-ons Blender starts with. Hover Launch and your sets are there to tick, so Blender opens with the ones this session needs — or double-click a scene and it brings the ones it was saved with. Opt-in, undoable, and launching Blender any other way is untouched. The longer version.
It finds them and links you to the store. Fetching someone's paid product on your behalf is not a third-party app's job.
That stays in Blender's preferences, where it belongs.
An add-on nobody has registered has no inbox to deliver to, so the launcher says so before you type the report rather than after.
The .blend routing in particular is Windows-specific.
Microsoft Store, Flatpak and Snap builds are not discovered, and Steam only in its default library. Anything else you add by naming the folder.
There is no uninstall button for a Blender build yet.
No account and no login. Settings, filed tickets and contact details stay on your machine. The update check sends add-on ids and versions with a random install id, which is a de-duplication key and not an identity. Bug reports have a button that strips usernames, paths, emails and tokens before anything is sent.
This is an independent companion tool, not affiliated with or endorsed by the Blender Foundation. Every build it installs is fetched from blender.org and nowhere else. Blender itself is GPL-licensed and belongs to its authors; the launcher only finds, fetches and starts it — and it will point you at Blender's development fund rather than take credit for the thing you actually came for.
Longer write-up, including the manual way to do all of this without installing anything: how to manage multiple Blender versions.