If you are facing issues accessing your company file because of QuickBooks Error 15270, it must be because of the internet connection is interrupted while downloading the update, The updates are incompatible with your current Windows operating system version, QuickBooks is running somewhere in background as well or The user has entered the wrong Employer Identification Number. For detailed instructions on fixing the error, follow the article linked here or dial +1-800-579-9430 for an expert's help resolving the issue.