QB Issue Resolution:

QB Enterprise 15 will now be sold as a subscription. You have to renew the subscription each year to continue using the program.

That’s kind of how the industry and software sales are changing. I’m pretty sure Sage started following this model a year or so ago too.

If you don’t like it, then buy QBES 14 while it is still available.

Resolution for Issue 'WHY CHANGE THE WAY TO BUY QUICKBOOKS ENTERPRISE 15.0??' available: Yes (Solved).
Source: Intuit Community forum.

WHY CHANGE THE WAY TO BUY QUICKBOOKS ENTERPRISE 15.0??: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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