First of all Lyubov wrote:
Note please, if you currently use Dolphin 6.1.4 you will need to upgrade to Dolphin 6.1.5 first, then you can apply the upgrade package to move to Dolphin 6.1.6. Licenses that you had and currently have in your Unity accounts will work for this Dolphin version. Post any problems you have with Dolphin 6.1.6 here. The post will be tracked and solutions provided.
Secondly, as I found out from AnreyP:
Before you should understand what is patch between 6.1.4 and 6.1.5.
This see more is all new files of version 6.1.5.
If you modified any files and if it after will replacing by patch - this will just your problem.
If you want to apply patch to modded site - you should Merge all changes self. To avoid all conflicts
Note please, if you currently use Dolphin 6.1.4 you will need to upgrade to Dolphin 6.1.5 first, then you can apply the upgrade package to move to Dolphin 6.1.6. Licenses that you had and currently have in your Unity accounts will work for this Dolphin version. Post any problems you have with Dolphin 6.1.6 here. The post will be tracked and solutions provided.
Secondly, as I found out from AnreyP:
Before you should understand what is patch between 6.1.4 and 6.1.5.
This see more