The standalone images now have been made available for all AP's in a single file, when you down the image file , you will get the images for all AP's and can use the one you want , this way you have images for all models and do not have to download a an image every time you have a newer model.
We have changed our firmware versions post 9.8, the 9.8 release was the last one to have standalone AP images , from 9.9 onwards there is no standalone images for AP's , all standalone images need to use the 100.x firmware releases. This is also the reason why you do not see standalone images for 9.10.
If you have a standalone AP and want to use the 9.8 version, you can download the 126.96.36.199.14 version which is the latest Maintenance Release , else you can use the 100.1.0..0.94 , which is also meant for standalone AP's.
MIB files are used to upload in a MIB browser to run SNMP traps etc to understand the networks performance and also to troubleshoot issues.
Thanks for your amazingly prompt response. I'm still confused about what my "software version" should say on the Status>Device page if I am fully up to date. Right now it says 188.8.131.52.14. Is this the most recent? I have no controller and never plan to use one.