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Several reasons can cause this "Invalid QuickBooks check" error. Please follow the steps below to fix it. If you still need assistance, please follow the last step and send us the data file "qbfile0001.txt".

https://www.halfpricesof...kbooks_invalid_check.asp 

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If you have further questions, please contact us directly at services@halfpricesoft.com
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I have the license, I have the virtual printer. It will not print checks… says not valid check format…