Old MYOB version customer may encounter the message "This App has been blocked for your protection" which blocks you from running MYOB.
Microsoft forces Windows 10 updates to block old version or dangerous programe. Below MYOB version may be affected:
Premier v13 or before
Premier v15 or before
Accounting v19 or before
To temporarily fix this problem, you can change information in Regedit of your PC by following the steps in MYOB Club 2.0