As of October 30, 2018. I tested this mod because I was interested in it and these are the results:

Most of the main features of this mod still work with the latest 1.0.1493.1 patch like being able to see the actual "icons" on the map and being able to buy the "safehouses" and enter them. That works fine. The features that did not worked were:

#1. Like I said, the "safehouse" icons show up on the map and you can buy the houses and enter the houses but, in my case when you open up the menu to enter the "garages", it doesn't work! Everytime I wanted to enter a garage adjacent to the house I ended up falling off the map and landing somewhere else, far from the safehouse.

#2. I couldn't find any "save" points/markers within the safehouses. Safe houses are supposed to be destinations where you can go into and save the current game progress, that's the point of safe houses but, in these ones I couldn't find any "save" markers within them so I could save my game. If you can't save your current game progress within these "safe houses" then what's the point of the mod then? I don't get it! "Safehouses" are supposed to be there and used in case you need a close-by location to save your current game progress but, you can't save your game in these "safehouses" because there are no "save game" markers inside of them....They're basically empty houses where you can go into but, can't "save" your game in plus wasted millions on purchasing them as well.

So on that note, I'll give a 3 out of 5 because doesn't work 100% as of the date I mentioned above! You can see the icons to the "safehouses" on the map and you can buy 'em but, you can't save your current game progress in them and you can't get into their garages because you fall off the map. This mod has to be re-worked.

By the way, I got "NativeUI.dll" in 'scripts' folder where it's supposed to go and the main mod's files installed correctly where they're supposed to go as well.