You can purchase 2018 program.   Make a backup of your data file in 2012.  Open the back up once you have downloaded the 2018 program.  Go to file>restore a back up file>find the file and restore it.  It will upgrade in the restoration of it.

Resolution for 'Accountant 2012 issue: 'Can I upgrade from Premier Accountant 2012 to Desktop version 2018' available: Yes.

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

For more information about resolving issues related to Accountant 2012 in Quickbooks/QBO or to get support for the issue 'Can I upgrade from Premier Accountant 2012 to Desktop version 2018', click the link below: