- The last version of Instant that supports the IAP-93 is 4.1.3.0
- The last version of Instant that works with the IAP-105 is 6.4.4.8-4.2.4.3.
- The IAP 205 and the IAP 215 support starts with instant 4.1.1.0 http://www.arubanetworks.com/assets/ds/DS_AP200Series.pdf
http://www.arubanetworks.com/assets/ds/DS_AP210Series.pdf
To support the IAP-105, IAP-93, IAP-205 and IAP-215, you must stick with software that is not better than 6.4.4.8-4.1.1.13
In other words, if you want to run instant 4.2.x.x, you need to replace your IAP-93s. If you want to run instant 4.3.x.x, you need to replace your IAP-93s and your IAP-105s. To run all of them you would just need to run a version of 4.1.1.x (like 4.1.1.13)
I hope that makes sense.