T-Cubed Systems, Inc.
RelCalc for Windows Requirements

Home
What's New

RelCalc MTBF Software
...Features
...Screen Shots
...Requirements
...License Overview
...Part Library

How to Order
...Price List
...Order Form

Free Downloads
FAQ
Our Customers

MTBF Consulting Services

About T-Cubed
Contact Us





.

V5.5 System Requirements
- Microsoft Windows: Win 10, Win 11.
- System Processor/Memory/Graphics: as required by your version of Windows.
- Disk Drive Space: approx 30 MB (not including data files that you create).
- Internet Connection: required for installation download, and license activation/reactivation/validation.
- Internet Connection Details (Single-User License): License activation, reactivation, and validation requires an Internet connection to allow access to the license server. After your license is activated/reactivated on your machine: every day that you use RelCalc there will be an attempt to connect to the license server for license validation. Note: once you connect/validate on a given day, RelCalc won't attempt to connect again until the next day (after midnight = new day).
- Internet Connection Details (Multi-User License): License activation, reactivation, and validation requires an Internet connection to allow access to the license server. The Multi-User License requires a continuous Internet connection while you are running RelCalc. This allows RelCalc to access the license server as needed to properly manage your floating license and concurrent users. Note that your Multi-User License is a floating license that may be installed and used on multiple machines by multiple users; the number of concurrent users is limited to the number of license seats that you have purchased.

For Windows 10/11 compatibility notes, please see the Win 10/11 FAQ.

Copyright (c) 2026 T-Cubed Systems, Inc. All rights reserved.
RelCalc (R) is a registered trademark of T-Cubed Systems, Inc.
Phone: 818-991-0057 Fax: 818-991-1281
E-mail: info@t-cubed.com Web: www.t-cubed.com