pity that you have such problems with the installation. I would like to help you, but my english is not so good.
I have two PCs Win 7 and Win 10 and on both PCs the installation of Deep Island was not a problem.
On my PC are several shards, Moula and an offline installation next to each other. This is not a problem if you change the installation path early during the installation of the CD.
If you have an offline installation on your PC and have already played some worlds, a new installation is needed for Deep Island.
For this you enter the CD again into the PC. After a few steps, you will be asked where you want the installation. Then you enter your own path. For example C: / Deep Island. Then just keep clicking until the installation is finished.
It is also possible that you will first be asked if you want to uninstall. You can do that, because only registrations are removed.
When the CD has been completely installed, on the self-created path.
Open the path (C: / Deep Island or another path) with a double-click. In the opened file you give the Patcher. The Patcher makes now from the offline game an online game.
Then click on the Uru.exe with the right mouse button and run as administrator.
I hope to see you in Deep Island soon