Our offices will be shut from close of business on Tuesday 23rd December 2025 until Monday 5th January 2026. Between these dates only credit card payments for ReFH 2 and WINFAP 5 will be dispatched, all other orders will go out in the new year. We will be providing limited software support on Monday 22nd and Tuesday 23rd December and the last posting date for LowFlows 2 dongles will be Thursday 18th December until Monday 5th January.
**Wishing you a very Merry Christmas and Happy New Year** :christmas_tree:
Our offices will be shut from close of business on Tuesday 23rd December 2025 until Monday 5th January 2026. Between these dates only credit card payments for ReFH 2 and WINFAP 5 will be dispatched, all other orders will go out in the new year. We will be providing limited software support on Monday 22nd and Tuesday 23rd December and the last posting date for LowFlows 2 dongles will be Thursday 18th December until Monday 5th January.
**Wishing you a very Merry Christmas and Happy New Year** :christmas_tree:

Can I open WINFAP 4 projects in WINFAP 5?

No, WINFAP 5 does not support WINFAP 4 project files (.feh4) nor the old Peak Flow Datasets (version 9 and earlier). WINFAP 5 uses the new NRFA Peak Flow catchment descriptor xml files, and has improved data auditing functionality.

To allow continued use for existing studies, the legacy WINFAP 4 can be installed alongside WINFAP 5 and we currently issue WINFAP 4 serial numbers with each WINFAP 5 purchase. Both versions are available from our downloads page.