Hi,
You need licenses for running tests in LoadRunner Controller.
There are no licenses required for the other LoadRunner components i.e VuGen and Analysis.
The licenses are grouped in Bundles base on the protocol which is used to create the Vugen script you are planning to run in the Controller. Please find a link to LoadRunner 11.5x licensing bundles. http://support.openview.hp.com/selfsolve/document/KM1412003
You will need to buy new licenses when your test requires more Vusers from a specific bundle type than the number of licenses that you currently have from this bundle.
Regarding the license which you are not able to install on another machine, usually you provide the controller machine Host ID when you purchasing new LoadRunner licenses. This means that you will not be able to install a license issued for one machine on another machine.
There is a new licensing mechanism starting from LoadRunner 11.50. This means that if the licenses were issued for an older version of the product and you want to upgrade to LoadRunner 11.5x the licenses should be reissued, so that they can be used with LR 11.5x.
The license can be reissued if you open a licensing case with HP Support. I would suggest you to check you licensing contract as well.
If you need assistance for buying new licenses please send me your contact details in a private message using the mail button located at the top right part of this page.
Kind regards,