QB Issue Resolution:

Make a backup.

Install the new program.

Restore the backup into the new program and this issue will be gone. It is a QB 2014 R6 issue, not QB 2015.

If you still need to be able to use QB 2014 with other data files, you can “uninstall and reinstall” the exec that is R5.

Resolution for Issue 'error 15271? cannot get from R6 to R7 on QB Premier 2014 to fix reports. Now have download for 2015 QB Premier. Can I do usual install/upgrade and all will be well?' available: Yes (Solved).
Source: Intuit Community forum.

error 15271? cannot get from R6 to R7 on QB Premier 2014 to fix reports. Now have download for 2015 QB Premier. Can I do usual install/upgrade and all will be well?: 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.

Support for Other
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