I found a new way to convert old .ahx files to work with 3.305. Open AHP 3.305 and load an old .ahx file. Room by room, click on any module you need to change. For Lamp Modules, right click on the module and change it from Lamp to Old Lamp. You can do the same process for wall switches. For any lamp or wall switches that are soft-start and using the LM14A to control it, you can make them regular lamp or wall switch modules.
I've already converted 8 ahx files that way. Saves a bunch of time, about 6 minutes per .ahx file.