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OST - 01.01 System Requirements and Installation Instructions

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If you haven't already installed On-Screen Takeoff, you start there. Before installing On-Screen Takeoff, be sure your computer meets our System Requirements. Keep in mind, the minimums necessary to run On-Screen Takeoff/Digital Production Control may not provide acceptable performance.

Please review these System Requirements and the Installation Instructions for your product before downloading or attempting to install.

Read the Release Notes for this version (and previous versions, if you like).

Visit the On-Screen Takeoff® Product Information and Downloads page for last-minute information about the current release (and to find past versions).

Installer Downloads
For most current versions, you can download the appropriate installer from the Co-Branded Customer Portal - if you need assistance, contact Support.

System Requirements

The most-current System Requirements and Recommendations can be found here: CLS - Classic System Requirements.

System Requirements for previous versions of On-Screen Takeoff can be found at the bottom of this article, under Related Articles.

Operating System for On-Screen Takeoff

Windows® 10 Pro or Enterprise, Windows Server 2016 (not as a desktop OS)

Windows® 11 Pro or Enterprise

32 Bit and 64 Bit operating systems are Supported.

You must keep your Windows system updated with all Microsoft' updates to install and continue to use our software.


At this time, ConstructConnect certifies our desktop products in the above environments only. Technically, they should work in the following environments, but we do not or have not done certification testing. There is no reason they shouldn't work - however there may be unidentified issues that our Support Team may not be able to resolve: 

  • Windows 365 (Cloud Windows)
  • Windows virtualized on a MAC
  • Citrix or other virtual desktops/application publishing environments
  • Windows® 7, Windows 8 and 8.1, and Windows Server 2012 (unsupported operating systems)
See Classic Product Windows Version Compatibility - OST QB DPC for more information on which versions of OST/QB are supported on which editions of Windows.
Before upgrading your computer to Windows 11 (from previous version of Windows), uninstall all On Center Software products. Then, once you have upgraded your operating system and applied all Windows Updates and drivers, reinstall the products.

CPU (Processor)


Intel Core i5 or faster


Intel compatible 1GHz processor or faster

Memory and Storage


8 GB RAM or more



1 GB Hard drive space (plus more for plans, projects)

Other Requirements

Minimum display resolution: 1280 x 1024

Internet connection required for licensing

Must be installed by Windows administrator

.net 3.5 required

Usually, if your PC is capable of running a supported version of Windows above, it should be able to run On Center's products.


Information on running OCS Products in an Apple environment can be found in: ALL - Using Apple hardware (a MAC) with On Center's Products.

To use the 'Price Using Excel' function, a fully-licensed , locally-installed version of Microsoft Office® Professional 2010, 2013, or 2016 must be installed.

If you are looking to share a database between multiple users, you must use Microsoft SQL Server, see CLS - Using SQL with Classic Products for more information.


On Center Software tests our software in conjunction with products currently under "Mainstream Support" with Microsoft. Once a version of Windows is 'retired' by Microsoft, On Center no longer tests or supports our software on that version. See CLS - Product End of Life (Sunset Plan) for more information.

The minimum system requirements support basic functionality of On Center Software programs. Actual requirements will vary, depending on your system configuration, other applications installed and running on your computer, the complexity of the electronic plans you use, and if you use the programs interactively.

If you are using a licensed version of On-Screen Takeoff, ensure you have your most current License Code(s) for the software (version specific). Then, download the appropriate version from the Product Information page, above. License codes are available in the Customer Portal.


Save the downloaded installer file to your local hard drive (the desktop is a perfect place, it is easy to find the installer).

When the download is complete, double-click the installer file - the "Installation Wizard" starts.

Click Next on the Welcome Screen (there is a link to the Release Notes and these installation instructions on the Welcome screen if you want to review them).

Review and Accept the End User License Agreement and click Next

Enter in the user and company name to which you want this installation of On-Screen Takeoff registered (this shows up on the "Splash Screen" and is associated with your product license although this does not change license ownership in any way) and click Next.


If you need to install to a directory other than the Windows default (<system drive>:\Program Files or <system drive>:\Program Files (x86)) click the Change button, otherwise click Next on the Destination Folder screen.

(We recommend installing to the default folder.)


Click Next to continue with the installation.


Click Install to continue with the installation - a progress screen displays


When the installation is complete, an information screen displays - review the information and then click Finish

After you click "Finish", a web page opens explaining how to license your product (also covered in the next article).

A shortcut to On-Screen Takeoff is placed on your desktop, double-click it to launch the program.

  • Users who have purchased On-Screen Takeoff must activate a license to unlock the full functionality of the program (next article). 
  • If you are using the free PlanViewer, you do not license the product and can skip to Quick Start Wizards.

previous article arrow What Have You Gotten Yourself Into? An Introduction to On-Screen Takeoff Licensing On-Screen Takeoff (Unlocking Full Functionality) next article arrow

Product documentation (user guides) describes functionality in the latest version of each major release and may not match the functionality in the version you are using. Please check the Product Information and Downloads pages by clicking one of the product buttons above.

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