Hi there, So we have just tried to install CIRCA and use it on a Windows 10 machine: [LIST] [*]The drivers are not digitally signed necessitating installation in a special mode [*]Running test it crashes with 'Exception EReadError in module CIRCA.exe at 0002989F. Error reading ComComboBox.ComProperty: COM Port Error: WriteFile failed on registry read. [/LIST] I have tried to run it in the various compatibility modes with no success. Please can you release a new component as we cannot complete the install until this is done. Thanks Mark