5D, DPP and lens correction question.

I used to own a 5D and shoot with an ef 20-35mm f3.5/4.5 for the occasional wide angle shoot. The 20-35mm gave ok results but suffered from CA/distortion. The CA/distortion was correctable via a Canon lens module in an older version of DPP which I used to use.

I'm thinking of getting a 5D (classic) again as they are going for silly prices. I thought I'd look at some of my old RAWs so downloaded DPP 3.11 and check how my RAWs from the 20-35mm looked, thinking I'd get another one, again very cheap on the second hand market.

I then tried to download a lens module from Canon for the 20-35mm and was surprised that it was missing from the downloadable modules. Have Canon stopped support for older lenses or is there a way I can get this module? The CA/ distortion on this lens with a 5D took an awful lot of fiddling to eliminate. I liked what the module did for this lens and would like to have it again.

Any help with locating the 20-35mm module or a link to an older version of DPP which includes it would be appreciated.