Upgrades Questions on upgrading to version 5.x.
Version 5.x > Upgrades > Upgrade from 5.0 to 5.5R2 View modes: 
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Mercer - 8/14/2011 3:41:27 PM
   
Upgrade from 5.0 to 5.5R2
Is a new license key required to upgrade from 5.0 to 5.5? Thank you.

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kentico_radekm - 8/14/2011 9:59:20 PM
   
RE:Upgrade from 5.0 to 5.5R2
Hello.

No, it is not. License key always works for all minor versions inside major version. So, it works for 3.x, 4.x and 5.x, where number is major and X is minor version.

Best Regards,
Radek Macalik