OpenTTM

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One installer covers every application and both 32-bit and 64-bit Microsoft Access. Choose which applications you want during setup.

Requirements

WindowsWindows 7 SP1 or later.
Microsoft Access Access 2010 or later. Not included — OpenTTM is an Access application and will not run without it. Either 32-bit or 64-bit works; the installer detects which you have and installs the matching version. If it cannot tell, it asks.
Disk spaceAbout 220 MB for one application, more if you install several.
Administrator rightsNot needed for a new installation.

Upgrading from an earlier version

Versions before 9.0.0 must be removed first. The installer detects the old version and offers to remove it. Windows will ask for administrator permission, because the old version was installed for all users. Setup cannot continue until it is gone.

Nothing of yours is removed. Your trial databases, the Documents\Total Trial Management folder, your saved trial folders and your settings all carry over untouched.

Since 9.0.0, OpenTTM installs for your Windows account rather than for the whole machine, which is why it no longer needs administrator rights and why the old version has to go: leaving both in place would put two entries in the Start Menu that look identical and run different software.

If more than one person uses this computer

Each Windows user runs the installer once. That is deliberate — a shared copy is not safe, because the program keeps working files inside its own front end while a trial is open.

File details

Check these if your browser or antivirus warns about the download, or if you want to confirm the file arrived intact.

Fileopenttm-setup-9.1.7.exe
Version9.1.7 — released 15 October 2026
Size40,032,648 bytes (38.18 MB)
SHA-25649B192BF38B8A046C07AB2D973C1C7E45EF43F94D692BA454C4040B7E32805D3
Signed byLTN Services LLC, with a timestamp, so the signature stays valid after the certificate expires.

To check the file yourself, open PowerShell in your Downloads folder and run Get-FileHash openttm-setup-9.1.7.exe. The result should match the value above.

What is new in 9.1.7

9.1.6 was never published, so its changes are new in this installer too:

Your data file does not change — 9.1.7 opens a data file from 9.1.2 or later with no upgrade step. Coming from 9.0.x? Everything in the releases in between is in this installer too; see the full release notes, newest first.

Previous version: 8.0.6a95

The last release before 9.0.0, kept here for anyone who needs to go back to it. Most people should use the current version above: it does everything 8.0.6a95 did, and its installer removes 8.0.6a95 for you.

openttm-setup-8.0.6a95.exe 9.3 MB · Windows
Fileopenttm-setup-8.0.6a95.exe
Version8.0.6a95 — released 18 January 2025
Size9,770,944 bytes (9.32 MB)
SHA-25660CC6C69BAAC6CE93F885E9A835B7AE9B38A78A09A84544717FB7D5102CE9BE1
Microsoft Access32-bit only.
Administrator rightsNeeded. It installs for every user of the computer.
Signed by LTN Services LLC, without a timestamp. From 10 January 2027 Windows will report the signature as expired, although the file itself is unchanged; check the SHA-256 above instead.

Uninstall 9.x first (Windows Settings → Apps) if it is on this computer. The two install in different places, so both would otherwise appear in the Start Menu looking alike.

Take a copy of your data file before opening it with 8.0.6a95. A data file opened by 9.x has been upgraded. The upgrades only add to it, but 8.0.6a95 has not been tested against one.