Recently, I have applied a license for our customer, but seem I can only got license for version 2.2. I have tried putting the license file I got, but seem can not reconizable and can not connect the database. Below is the message from the "GOLD"

[30 Jul 10:43:52 (I)] Log opened.
[30 Jul 10:43:52 (I)] startup: enabling default authentication methods
[30 Jul 10:43:52 (I)] startup: connecting to database
[30 Jul 10:43:52 (I)] startup: testing for valid licensing
[30 Jul 10:43:52 (E)] startup: unable to check out a license. Please fix your licensing before starting GO-Global UX.
[30 Jul 10:43:52 (I)] Log closed.

If this license file is version 2.2, shall I downgrade it to version 2.1? Or, how do I fix this?

What version of GGU are you using and did you obtain a demo or permanent license?