OAK is free to try

To get started with OAK, download it from this web page and install it on your computer. It will function for 30 days from installation. It’s the full thing, not restricted in any way.

Have you already evaluated OAK 4.0, 4.1 or 4.2?

Even if you have already evaluated OAK 4.0, 4.1 or 4.2, the current version 4.3 will provide another 30 day evaluation period.

Do you already have a license for OAK 4.0, 4.1 or 4.2?

If you already have a license for OAK 4.0, 4.1 or 4.2, you do not need to buy a new one to use this version. However, OAK 4.3 uses a different licensing system, which in the presence of adequate internet connectivity, completely automates the purchasing and activation of licenses.

If you upgrade an existing licensed installation, your old license will continue to work, and you will have the facility to exchange your old license key for a serial number.

If you perform a clean installation, you will need to contact Operis’s London office to get a new serial number.


OAK is packaged as a single .msi file.

Excel 2000-2007
Excel 2010-2016 32-bit
OAK for 32-bit Excel17 MB
Excel 2010-2016 64-bit
(How to tell if you are using 64-bit Excel)
OAK for 64-bit Excel17 MB

These installers do not install any of OAK’s prerequisites, as we believe it is unlikely they are not already installed. These prerequisites are listed here: OAK Prerequisites