Where to download PsiWin 2.3.3 Psion software

PsiWin installed under Windows 10 Pro

One question I get asked a lot is where can I download PsiWin, the official Psion software that connects your Psion palmtop computer to Windows. This post answers that.

Psion palmtops

There appears to be a bit of a retro resurgence of interest just now in the old Psion palmtop computers. Between 1996 and 2008, I was a proud Psion user of the Siena, Psion Series 3c, Psion Series 3mx, Psion Series 5mx and Psion Series 7 (upgraded with a netBook personality module); I even owned a Psion Revo just to see what they were like. I sold all my Psion hardware in 2017 as life was taking me in a different direction and I’d not used any of the machines fully for nearly ten years.

Where can I download PsiWin 2.3.3?

Most weeks I get at least one email from someone asking me where they can download the PsiWin connectivity software. I thought it would be useful to link to these downloads.

Note that the German/Deutsch version is 2.3.1 not the later 2.3.3; I don’t know if there ever was an update.

For completeness, here is the entire collection of 16-bit PsiWin 1.1 (updated for Y2K) in Deutsch, English, Français, Nederlands, and Italiano:


No technical support

Unfortunately, I can’t offer any technical support for PsiWin connectivity. I don’t have any Psion devices any longer.

Installation issues

I have recently had issues installing PsiWin 2.3.3 English on my Windows 10 Pro (64-bit) desktop machine, but it installed fine on my Windows 10 Pro (64-bit) laptop. Using Process Explorer, I narrowed the problem down to an application related to my NVIDIA graphics card and when I closed that process, the installation completed successfully.

32-bit vs 64-bit

Bear in mind that if you are running a 64-bit version of Windows, PsiWin 2.3.3 is a 32-bit application so it will not integrate fully into Windows Explorer the way it does under a 32-bit version of Windows.

Also, during installation, you may encounter an error message saying that it cannot install the 16-bit elements of PsiWin. This is understandable. Windows 10 64-bit doesn’t support any 16-bit software (without using something like DOSBox). Just acknowledge the error and carry on. It won’t affect the application.

Connecting to the Psion

Hmmm… this is actually one of the reasons that I stopped using my Psions. It became too burdensome to work out how to connect.

I had a hardware RS-232 serial port and also a handful of USB-to-Serial adapters. But PsiWin appears to be very particular about which adapter it accepted. I found the Videk 2499G to be fairly reliable.

At one point, after I upgraded to a 64-bit version of Windows, I was dual booting to a 32-bit version of Windows 7. Then I relied on a virtual machine but even that became too much hassle, to keep an entire operating system up to date within a VM just to connect to my Psion.

If you do manage to get things connected, one piece of advice is that Windows likes to have the baud settings for your serial COM port as high as it will go, rather than the Psion default. So, for example, the Psion 3mx connects at 57,600 baud. On my Windows 98se machine I would set the COM1 port setting to match this setting (i.e. 57,600). However, under Windows XP it likes COM1 to be set to its maximum value.

Converting Psion files

One of the main reasons that I’ve found people wanting PsiWin is to convert old files. This still works and is a standalone application and assuming a standard installation can be found at: C:\Program Files (x86)\Psion\PsiWin\Cpycnv.exe.

Psion File Converter

On the older, 32-bit machines (Series 5, 5mx, 7 and netBook), the easiest way to retrieve files from the Psion is to copy them from the machine to a Compact Flash (CF) card and then transfer them using a USB-to-CF adapter.


I hope this is useful to some people. I will add to this post as I remember things and as questions continue to trickle in from people about PsiWin. Also, if you find something helpful please do leave a comment.

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Gareth Saunders

I’m Gareth J M Saunders, 49 years old, 6′ 4″, father of 3 boys (including twins). Enneagram type FOUR and introvert (INFP), I am a non-stipendiary priest in the Scottish Episcopal Church, I sing with the NYCGB alumni choir, play guitar, play mahjong, write, draw and laugh… Scrum master at Vision Ltd, Dundee. Latterly, web architect and agile project manager at the University of St Andrews and former warden at Agnes Blackadder Hall.

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