This is annoying as I like to have a version of DS3 and 4 installed as I still prefere Ds3 for some things as it is faster on my old system.

Seems I'll have to skip the DS4.5 update.

They should make it so you can have more than one version installed if you want to like I have always been able to do in the past. 

I've had Ds3 and Ds4 working happily together for ages why have they changed this?