IRIS Accountancy Suite Support Downloads
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.NET 4.8 and MSVC 2022 notification
From April 2024 IRIS Accountancy Suite requires .NET 4.8 and MSVC 2022.
Microsoft .NET 4.8 can be downloaded from here.
MSVC 2022 can be download from here.
New Installations
For brand new installations, please ensure to download and install SQL Server before starting the IRIS installation.
The SQL Server 2019 Express download can be obtained from here.
Note: SQL Express – is available from Microsoft for free and is only recommended for use for up to 6 users. Full System Requirements can be found here.
To download and learn more about the limitations of SQL Express against the SQL Server Standard version, visit the Microsoft website here.
Detailed instructions for installing SQL (in the example) can be found here and instructions for installing IRIS can be found here.
Terminal Server/LPO Downloads
Both Terminal Server(s) LPO and the main IRIS installer must continue to be maintained at the same version and build number at upgrade time; the version and build number can be seen in any Help/About dialog.
To download LPO Installations please click here.
IRIS Installations
Please download the required release depending on which version is installed. To find the version installed, open IRIS and go to Help | About. The version will be shown on the right-hand side.
Full Install denotes a Full release that can be used for fresh installations and upgrades. All Full installs need to be upgraded in succession, it is not possible to skip any updates.
Upgrade Only denotes a Service Pack, used to upgrade existing installations.
We recommend that you review the Known Issues before installing the latest release of IRIS Accountancy Suite.
Main releases
| Type | Version Installed | Download | Details |
| Full install | Upgrades v25.3.0.601 v25.4.0.155 v25.4.12.37 (optional release) v26.1.0.639 (Spring Early Adopter release) | Download and install v26.1.0.640 | Release notes |
| Upgrade | Upgrades v25.4.0.155 | Download and install v25.4.12.37 This optional release includes updates to Company Secretarial paper forms to reflect Companies House fee increases effective the 1st February 2026 and, Accounts Production updates. Note: All features delivered in this service pack will be available in the Spring release v26.1.0, due w/c 30th March 2026. | Release notes |
| Full install | Upgrades v25.3.0.601 | Download and install v25.4.0.155 This release is optional (not required to install the Spring 2026 release) | Release notes |
| Full install | Upgrades v25.2.0.378 | Download and install v25.3.0.601 | Release notes |
| Full install | Upgrades v25.1.4.42 | Download and install v25.2.0.378 | Release notes |
| Upgrade | Upgrades v25.1.3.33 | Download and install v25.1.4.42 | Release notes |
| Upgrade | Upgrades v25.1.0.734 | Download and install v25.1.3.33 | Release notes |
| Full install | Upgrades v24.3.2.46 | Download and install v25.1.0.734 | Release notes |
| Upgrade | Upgrades v24.3.0.553 | Download and install v24.3.2.46 | Release notes |
| Full install | Upgrades v24.2.0.383 | Download and install v24.3.0.553 | Release notes |
| Full install | Upgrades any of the following: v24.1.0, 24.1.4 and v24.1.9 | Download and install v24.2.0.383 | Release notes |
| Upgrade | Upgrades v24.1.0.578 | Download and install v24.1.4.33 | Release notes |
| Full install | Upgrades v23.3.1.45 and v23.4.0.336 | Download and install v24.1.0.578 | Release notes |
| IRIS Time & Fees hotfix | Apply to v23.4.0.336 | Download and install hotfix | Link to KB article |
| Upgrade | Upgrades v23.3.0.418 | Download and install v23.3.1.45 | Release notes |
| Full install | Upgrades v23.2.0.158 | Download and install v23.3.0.418 | Release notes |
| Full install | Upgrades v23.1.0 and v23.1.5 | Download and install v23.2.0.158 | Release notes |
| Upgrade | Upgrades v23.1.0 | Download and install v23.1.5.20 | Release notes |
| Full install | Upgrades v22.3.0, v22.3.3 and v22.4.0 | Download and install v23.1.0.753 | Release notes |
| Full install | Upgrades v22.3.x and new installs | Download and install v22.4.0.132 | Release notes |
| Full install | Upgrades v22.3.0.621 | Download and install v22.3.3.48 | Release notes |
| Full install | Upgrades v22.2.0.402(d) and (e) | Download and install v22.3.0.621 | Release notes |
| Full install | Upgrades v22.1.0.628 and v22.1.4.3 | Download and install v22.2.0.402(d) | Release notes |
| Upgrade | Upgrades v22.1.0.628 and v22.1.2.16 | Download and install v22.1.4.3 | Release notes |
| Full install | Upgrades v21.4.171 | Download and install v22.1.0.628 | Release notes |
Software versions prior to v22.1 are available here.
IRIS Anti – Money Laundering
| Type | Version | Download | Details |
| Full install | v26.1.1 | Download and install | Upgrades all previous versions |
IRIS Docs
| Type | Version | Download | Details |
| Full install | v6.27 | Download and install | Release notes |
For further details and support on upgrading IRIS Docs, visit the IRIS Help Centre.
IRIS VAT Filer
| Type | Version | Download | Documents |
| IRIS Standalone VAT Filer (upgrades all previous versions) | v23.2.0.5 | Download and install | VAT Filer Help Making Tax Digital |