Welcome to Ultimate Edition alfagamma81 !
Regarding your question about the Theme and how to install - If the downloaded file is only an archived version of a
.deb file, just extract it and double-click on the resulting
.deb file and it will open the DEB installer and you just follow the prompts. Other wise, I think you will have to copy the folder containing the Theme files to
/usr/share/themes and set the permissions and ownership the same as the other theme folders there. I could be incorrect about that, however... NOTE: Anyone else with a better answer to this question, please chime in...
As to the reasons that programs such as Google Earth and Adobe Flash Player are not "pre-installed" in Ultimate Edition (or any other OS) - it is because these programs are NOT FREE - they are Copyrighted - and require
you the end user to "Accept" their EULA or complete some other requirement for permission to use the program. There may not be any actual "monetary charges" associated with the use of the program, but the program's
owner/creator/publisher/etc.. has specified some requirement be fulfilled before you can
legally use it. In order to avoid any copyright or other problems with such programs or utilities they are not "pre-installed" so that you, the end user, can complete the program's requirements for use at the time of installation. Basically, such programs require the end-user (you) to meet those requirements before you can "legally" use such software..
BTW: Be sure to check out the articles and posts in the
How Tos section of the forum for the answer to many common questions/problems encountered by others - it might save you some typing. I hope I provided some help with your problem, but do not hesitate to ask if you should need any additional assistance - we are all here to assist when able. And, again... Welcome to Ultimate Edition!!