Mixed licensing / subscriptions questions

We remind you one month before it expires. And we don’t punish you when you renew after your license expired; we give you an advantage when you renew early.

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Edit: I forgot to mention in my original post that the model assumes that one is purchasing extensions before they expire. Else, as far as I understand, the $89/1-year, $159/2-years, or $209/3-years discounted pricing is not in effect, and the pricing goes up to $99 per year for DTPro4, no matter how many years is purchase.


Edit #2: There’s an error in Scenario 4 concerning the price of DTPro4 Extensions, currently shown as $89: only one of these Extensions could be purchased at that discounted price, with the proviso that it would be purchased for Year 2, and prior to Year 1’s updates expiring, and the others would cost $99, as they would be purchased outside of any then-current Extension’s active period. Otherwise, the price of all of these Extensions would be $99.


I put this together to try to chart my path going forward, and share it with these caveats:

I’m not a DEVON employee, just a user of their products. Use this information at your own risk. Do not rely on this information for your purchasing decisions. Verify the numbers and method for yourself.


This is a comparison of the costs of four scenarios that provide access to DTPro4 and DTTG4, for a period of 7 years. A 7-year period is used because:

  • Year 1 of each of the four scenario consists of the DTPro3->DTPro4 upgrade, which includes DTPro4 updates, and access to DTTG and its updates, for 1 year.

  • For scenarios 1-3:

    • Years 2-7 is a period of 6 years, which allows using whole multiples of 1-, 2-, and 3-year DTPro4 license Extensions, in scenarios 1-3 every 1, 2, and 3 years, respectively, to maintain continuous DTPro4 updates, and continuous use of DTTG4.

    Therefore, (1 + 6 =) 7 years used in this modeling exercise.

    It’s possible to model 2, 3, 5, however many, years, but accommodating durations after year 1 that are not divisible by 6 (the least common multiple of {1, 2, 3}) involves calculating fractions of the costs of the applicable Extensions that are impossible to purchase in the real world.

Scenario 4 attempts to reduce the cost, by:

  • Purchasing DTPro4 license Extensions:

    • only every other year,
    • each for a period of only 1 year (sacrificing DTPro4 updates and access to DTTG4), and
  • Because DTTG4 will in effect cease to function if a DTPro4 license Extension is not in effect:

    • filling in those gaps with 1-year subscriptions to DTTG4 for the years that do not purchase DTPro4 license Extensions.
  • Note that individuals’ real-world requirements, and the nature of future DTPro4 updates, may disrupt or enhance this scenario’s purchasing schedule, or even render it irrelevant, changing the cost accordingly.

I’m not a DEVON employee, just a user of their products. Use this information at your own risk. Do not rely on this information for your purchasing decisions. Verify the numbers and method for yourself.

Sources of price data:


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