QB Issue Resolution:

Would you please try following steps to solve this problem:
> Delete UpdateVersionInfo.xml from SyncManager folder location given below
> Exit Sync Manager
> Launch Sync Manager

SyncManager folder location is:
Windows 7: “C:UsersAppDataLocalIntuitSyncManagerUpdateVersionInfo.xml”
Vista: “C:UsersAppDataLocalIntuitSyncManagerUpdateVersionInfo.xml”
XP: C:Documents and SettingsLocal SettingsApplication DataIntuitSyncManagerUpdateVersionInfo.xml

If problem still persist even after deleting UpdateVersionInfo.xml, Please provide the logs which can helps us to know the problem, Please refer link below to get SyncManager logs:

You can send the log zip to Email-ID: [email protected]

Resolution for Issue 'Continually prompted to Update Sync Manager?' available: Yes (Solved).
Source: Intuit Community forum.

Continually prompted to Update Sync Manager?: 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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