LUM Alongside CATIA V5 R21 & R22

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

LUM alongside CATIA V5 R21 & R22 1   

2) On the right of Computer Properties Dialog box, select Advanced System Settings

LUM alongside CATIA V5 R21 & R22 2

3) Select Environment Variables... in the dialog box

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4) In the Environment Variables dialog box, select New and enter the Variable Name DSLICENSING and in the Variable Value enter LEGACY

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5) Click OK to all boxes and proceed to open the application.