Fast Script Launcher — Changelog

Every published release of Fast Script Launcher, newest first. Builds that never left testing are listed too, so the numbering stays complete.

Current version 4.1.25 Autodesk Revit 2022–2027 Windows 26 released versions

⬇︎ Get the latest version Read the user guide →

Version 4.1.25latestSeptember 13, 2026

Fixed

Ribbon icon is back to the standard ArchPlug green. The previous release carried an internal test build in which the icon had been recoloured; only the icon was affected, no command or setting behaved differently.

Version 4.1.23September 13, 2026

New

Anonymous usage counters: which command was run and how often, so development follows what is actually used. No e-mail, file names, model or project data is sent. Switch it off with "send_usage": false in C:\ProgramData\ArchPlug\settings.json.

Fixed

The background updater no longer opens an empty black PowerShell window. On Windows 11 the default terminal ignored the hidden-window flag, so the window stayed on screen for as long as Revit was open (ArchPlug Settings 1.29.9).

Version 4.1.21September 6, 2026

New

Full Python traceback in the error report - file, line and call stack of the script itself, instead of the bare .NET stack that said nothing about where the script broke.
Local log file %APPDATA%\ArchPlug\logs\<plugin>.log (rotated at 512 KB, one previous file kept, Windows user name removed). It can be sent by e-mail when there is no internet connection.

Changed

The error dialog says in one sentence what happened and what to do; the traceback sits behind 'Show details', with the log path and the support address in the footer.
The ArchPlug settings window carries the ArchPlug icon in its own title bar. A window with no icon of its own borrows the one from the running program, so until now the title bar showed the Revit logo.
Shared ArchPlug Core runtime cleaned up to 1.0.6: 324 unused standard library files dropped, and the download is about 40% smaller. Nothing the plugin actually imports was touched, and a new gate checks the runtime before every Core release.

Fixed

shutil, tempfile and zipfile could not be imported from the shared runtime at all: Lib\shutil.py had been syntactically broken in every ArchPlug Core since the first one, so any script touching a temporary file or a zip archive failed for no visible reason.
An empty script list read as a broken tool - the status line said only '0 scripts'. It now says that no .py or .dyn file was found in the scripts folder set in ArchPlug Settings.
Clicking the ribbon button with no project open no longer produces an error dialog - the plugin says 'Open a project first.'
Licence check hardened: it fails closed when it cannot verify, a tampered stamp no longer earns extra grace days, the newest trace wins when the two stamps disagree, and an expired offline token is reported as 'offline too long' instead of 'cannot verify'.

Removed

Process-wide TLS protocol override that every other Revit add-in inherited.
Unused ensurepip package from the shared runtime, together with the pip and setuptools archives bundled inside it. They were never opened by anything we ship.

Version 4.1.20September 5, 2026

Fixed

Installer failing with 0x80091007 (shared runtime hash mismatch). The setup carried the checksum of one version of the shared ArchPlug Core runtime while downloading another, so installation stopped on every clean machine.

Version 4.1.18September 2, 2026

Changed

First release delivered by the silent updater, which from this build applies an update while Revit is running and no longer needs Revit to be started at all. Shipped to testing only.

Version 4.1.17September 2, 2026

Changed

Interim build from the same release round; superseded the same day by 4.1.18.

Version 4.1.16August 30, 2026

Changed

A separate, plain message for every licence state - no account entered, unknown account, account without this plugin, expired trial (with the purchase options), N days without a connection, active on another computer. Four of those states used to end up as the same sentence, 'Connect this computer to the internet'.
Released 2026-09-01. The licence button is 'Refresh'; prices are never written into the DLL.

Fixed

With no e-mail entered the licence check was never sent at all, so the cache stayed 'unknown' and the plugin dropped into the 10-day offline window and then locked.

Version 4.1.15August 30, 2026

Changed

Build from a release pass that did not finish; never published.

Version 4.1.13August 30, 2026

Changed

Build from a release pass that did not finish; never published.

Version 4.1.12August 25, 2026

Changed

Only the plugins the account actually owns run; a trial of one plugin no longer unlocks the rest, and an unknown account is told so instead of being blamed on the internet connection.

Version 4.1.11August 25, 2026

New

One account, one computer at a time: if the account is in use elsewhere the plugin says so instead of failing silently. Closing Revit releases the seat.

Version 4.1.10August 25, 2026

Changed

The licence follows the account (e-mail), not the computer. The server signs the answer, so a hand-written cache file no longer unlocks anything, and the plugin keeps working for 10 days without a connection.

Version 4.1.9August 25, 2026

Changed

Interim build from the same release round; superseded the same day by 4.1.10.

Version 4.1.8August 23, 2026

Fixed

The licence check now really blocks unlicensed use, as in the other six plugins.

Version 4.1.7August 23, 2026

New

A licence check. Since 4.0.0 the licence code sat in a source file the build excluded, so Fast Script Launcher ran unlicensed.

Changed

Interim build from the same release round; superseded the same day by 4.1.8.

Version 4.1.6August 19, 2026

Fixed

Code review round: 67 of 71 findings fixed, verified on Revit 2022, 2025 and 2027.

Version 4.1.5July 27, 2026

Changed

On 2026-08-02 this installer was repacked with a signed ArchPlug Settings component, which removed Revit's 'Unknown Publisher' warning. The version number was not raised, so an existing installation does not see it as an update.

Fixed

The plugin never appeared in Revit 2027: the manifest went to the 64-bit add-ins folder and the package is now built as x64, without which Windows Installer redirected it to Program Files (x86).

Version 4.1.4July 17, 2026

Changed

Error reporting made GDPR-safe: no e-mail address is sent, the Windows user name is removed from file paths, and the first report asks for consent (Send this report / Always send / Never).

Version 4.1.3July 17, 2026

New

Automatic error reporting - when the plugin fails, the error is reported to archplug.com so it can be fixed without waiting for a bug report.

Version 4.1.2July 17, 2026

Changed

The script is embedded in the DLL as an AES-256 encrypted resource; the installer no longer ships plain-text Python.

Version 4.1.1July 16, 2026

Fixed

Revit 2022 compatibility round: element name and Id handling, JSON helper, and text that did not fit the window at high DPI.
Crash when the script path could not be resolved.

Version 4.1.0July 1, 2026

Changed

Installer and plugin DLL are digitally signed (publisher: ArchPlug DOO). No functional changes.

Version 4.0.0May 25, 2026

Changed

New launcher build. The licence check was left out of the build by mistake and only came back in 4.1.7 - between these two versions Fast Script Launcher ran without any licence.

Version 3.6.1May 21, 2026

Maintenance release.

Version 3.6.0May 16, 2026

Maintenance release.

Version 3.1.0April 25, 2026

Maintenance release.

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Every plugin updates itself — you do not have to reinstall. This page exists so you can see what changed before you do anything.

Questions about a specific release? Write to support@archplug.com.