DU Meter Upgrade Information

Upgrade to DU Meter 4.16 from DU Meter 4.x

DU Meter 4.x updates are free for anyone who bought a license for DU Meter 4.x. Just download and install a new version on top of your existing one, and all settings will be preserved and your registration information recognized.

Upgrade to DU Meter 4.0 from any previous version

DU Meter 4.0 is a major upgrade to DU Meter 3.x. We have been working hard, and are very proud of our achievements. DU Meter 4.0 contains many additions and refinements over the previous version.

DU Meter 4.0 will not accept DU Meter 3.x serial numbers. Our most recent customers will receive a free upgrade. Other DU Meter or TweakMASTER PRO users who wish to upgrade to version 4.0 should purchase an upgrade license, and we are offering generous discounts to current customers. The exact coupon value depends on how much you paid for your current license and when you have purchased it.

How to receive a discount coupon or free upgrade license

Please enter your user name, email address and serial number exactly as specified in your original purchase confirmation email, and we will send you the free license or discount coupon and instructions for how to apply it, by email.

At least two fields below must match the information in our database of registered users. If you changed your email address since you registered our software, you can specify your new address here only if you write your name and serial number exactly as it's written in the purchase confirmation email. This database is updated every 24 hours. If you have purchased recently, your order information may not be in our system yet.

In most cases this automated response system will be the fastest solution for you. However if for some reason your previous order is not found in our database, or if you bought multiple copies of DU Meter and qualify for a bigger discount, then please send us an email and our support staff will have to look up your order and send a discount coupon manually. Please supply as much information as possible. Manual lookup can take up to 72 hours.