Try installing the other version in a seperate directory, although Windows may tell you that it's already installed. For instance, if Secureremote is installed on C:, try installing Secureclient on a seperate partition, like d: if you have one. If not, than no, you have to use one or the other upon install.
Since you can only use one, try creating another profile, by right-clicking on the key and choose settings. There, you will be able to create a new site. Bear in mind, you have to the know the ip, username and password and the other configs that may have been customized for connectivity. Hope that helps.