Lightroom Mobile requires a CC subscription plan:
Does Lightroom 5 include access to Lightroom mobile?
Lightroom mobile is included as part of the following Creative Cloud membership plans:
- Creative Cloud Photography plan
- Photoshop Photography Program
- Creative Cloud complete plan
- Creative Cloud Student and Teacher Edition
- Creative Cloud for teams complete plan
If you have access to Lightroom 5 via your Creative Cloud membership, then you have access to Lightroom mobile.
Since Lightroom mobile is a service, it is available only via membership plans. Lightroom 5 perpetual license does not include access to Lightroom mobile.
Without a CC subscription I believe you only have a 30-day trial period:
If you have perpetual license for Lightroom, Lightroom mobile gives you the opportunity to use Lightroom mobile for a 30 day trial. If you use the trial, you can get assistance through our forums:
- forums.adobe.com > Lightroom
- feedback.photoshop.com/photoshop_family