FabFilter

Bought Pro L 2 limiter , but want to use Pro L 1 ( version before that) , what license i should paste in , I pasted the one for Pro L 2 but it does not take it !

Your account automatically offers you a license key for earlier versions of plug-ins that you own. First log into your account: www.fabfilter.com/myaccount

Click 'View license key' next to your most recent order for a plug-in, e.g. Pro-L 2. Then, click on 'View license keys for earlier versions' in the top-right corner of the page. The license keys for earlier versions will now be displayed.

You can download all earlier plug-in versions here:
www.fabfilter.com/support/downloads

Cheers,