It should be possible to install multiple versions of RailClone but only by using different Max versions. You can do by doing the following steps:
- Install the old version of RailClone first. Just use a regular installation
- Install RailClone 5 beta, Select advanced installation and choose the versions of Max you wish to use with this version.
Please be aware that if we release an update to RailClone 4 and you would like to install it you will need to follow both the above steps again.
I hope that helps,