From May 7th HMRC no longer accept RTI, CIS Submissions or Sending of HMRC messages for the following operating systems:
Windows 7, Windows 8, Server 2008, Server 2012 or 2012R2.

If you use any of the above, to continue to send HMRC submissions, you will need to upgrade your current operating system or move the payroll to a computer with Windows 10 or later. Moving payroll to a new PC

This is due to security upgrades that are incompatible with the listed older versions of Windows. There are no workarounds, IRIS Support can't help as HMRC are not accepting the submissions.

Windows 10 and 11 will continue to work.

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Release Notes PDF
Details the changes made in the latest version of the software
Download the latest release
Guide to my ePay Window Guide to setting up IRIS myePayWindow in your software
Getting Started PDF For new users, a guide to get you up and running
Year End Guide to completing the tax year
RTI PDF Guide to completing your real time submissions
Automatic Enrolment How AE works
Automatic Enrolment Configuration PDF Guide to setting up AE in your software
AE Suite PDF IRIS OpenPayslips & IRIS OpenEnrol
NEST Integration PDF Sending AE Data to NEST via Secure File Transfer Protocol (SFTP)
Installation PDF Guide to setting up payroll on your PC
Moving payroll PDF Moving payroll to a new PC or network location
Legislation Details of PAYE and AE Legislation
Employee Verification IRIS employee verification