I downloaded the Mac-qt and when I run it the wallet wants to make changes to my computer, WHY? This has not occurred with any other wallet? Be careful, please explain...

I noticed the config file has mining server enabled by default, don't know if that's what might be triggering it, not on a mac.
The wallet need root privileges to run. Beceause it can't make datadir on Apple Support folder like other wallets. I made a custom launcher to force it, otherwise it will not launch. You find the original wallet inside the the package, if you you try to lauch it, you will get a boot error.
For "Xaucoin wants to make changes when you run it.." message there is a discussion about that,
https://discussions.apple.com/thread/6731721.
You can try also Iridium Wallet (dead coin)
https://bitcointalk.org/index.php?topic=735152.0 , they are similar and tell me if you have this message.
if anyone look to karimdr2 post history they have built many mac wallets for other coins