ACER ConQuest 5 Installer - Windows (with free 30-day trial)

Author(s) : Adams, R. J., Wu, M. L., Cloney, D., Berezner, A., and Wilson, M.R. (2020)

Publisher : ACER

SKU : E1101

In stock
In stock
Available for download

ACER ConQuest 5 is a major version update to ACER ConQuest.

ACER ConQuest is a computer program for fitting both unidimensional and multidimensional item response and latent regression models. It provides data analysis based on a comprehensive and flexible range of item response models (IRM), allowing examination of the properties of performance assessments, traditional assessments and rating scales.

ACER ConQuest also offers wider measurement and research community analysis procedures based on the most up-to-date psychometric methods of multifaceted item response models, multidimensional item response models, latent regression models and drawing plausible values.

This is the installer for ACER ConQuest 5. It can be used with sample sizes up to 3000 participants. For sample sizes greater than 3000, an Extended Licence is required.

ACER ConQuest 5 is available with both a graphical user interface (GUI) and a simple command line, or console, interface. The GUI version is available for all Windows platforms.

The trial can easily be converted to a standard version without needing to reinstall the software. The trial period begins when you install the software and continues for 30 days. After the trial period, you must purchase a licence to continue using the software.

You may also be visiting this page to upgrade to the latest version of ConQuest, or to re-download the installer because you have a new computer.

In these cases, once you have reinstalled ConQuest:

  • You will be able to use your existing licence key if you are reinstalling in the same year as you purchased the key.
  • If you have lost your key, you will need to email us at and advise us. Please include as much information about your original purchase as possible.
  • You will also need to email us at to obtain a new key if you are reinstalling in a year other than which you purchased your original key. Please include your old license key in your email.

(Note: reinstalling the software does not initiate a new trial period - trials are limited to one per person. If you have already completed a 30-day trial, full use will require a licence key.)

Before you download the software you are required to read the below licence agreement.

ACER ConQuest, ACER Licence Agreement

ACER ConQuest  Notes and Tutorials

Adams, R. J., Wu, M. L., Cloney, D., Berezner, A., and Wilson, M.R. (2020)