CATIA V5R21 and upwards by default looks for a DSLS type of license. In order to use LUM type of license with CATIA R21 & R22 (CATIA V5-6R2013 (R23) upwards is not supported with LUM!)
1) Go to Start > right click on Computer > select Properties
2) On the right of Computer Properties Dialog box, select Advanced System Settings
3) Select Environment Variables... in the dialog box
4) In the Environment Variables dialog box, select New and enter the Variable Name DSLICENSING and in the Variable Value enter LEGACY
5) Click OK to all boxes and proceed to open the application.