There should be no problems stepping up to 17 from 12

Install 2017 and during installation select custom install, a couple of screens later insure the save path ends in 2017 so that your current install is not overwritten

then run a rebuild on 2012 several times and then run verify,when that […]

Resolution for '2012 UPGRADE issue: 'QB ACCOUNTANT 2012 UPGRADE' available: Yes.

The 2012 UPGRADE 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 2012 UPGRADE issue yourself by looking for a resolution described in the article. If it is a complex 2012 UPGRADE issue or you are unable to solve the issue, you may contact us by clicking here or by using other 2012 UPGRADE support options.

For more information about resolving issues related to 2012 UPGRADE in Quickbooks/QBO or to get support for the issue 'QB ACCOUNTANT 2012 UPGRADE', click the link below: