Hello LealSoria and welcome to the ArtRage forums 
The current retail version of AR is ArtRage 6 and was released this summer.
With regards your old tablet, if Wacom are still releasing drivers for it then it should still work with AR6.
If you want to you could download the Demo version of AR6 and see how well it works with your tablet before upgrading your old version of AR. You can find the Demo here: https://www.artrage.com/demos/
And don’t forget that as an existing owner of AR you can get a 50% discount when you upgrade to the latest version. Details here: https://www.artrage.com/upgrades/
Maker Of Replica Macoys
Techie Stuff:
ArtRage 6.1.1 ~ 15" Macbook Pro ~ macOS 10.14.6 ~ 4 Core i7 3.1GHz CPU ~ 16GB RAM ~ Wacom Intuos4 M