Thanks for explaining more.
I misunderstood your original post and thought you meant the exported video was 1.8GB.
If it is the project size that is 1.8GB then that is unusually large. If you look at the sample projects supplied with CrazyTalk you will see almost all of them are under 50MB.
I would advise when working on a project to save each time as a separate project file. This way should you encounter an issue you can drop back to a previous version of that project. Also while CrazyTalk 8 allows projects up to 15 minutes long, you will find you get best performance with projects under 2 to 3 minutes.
I also wouldn't worry that CrazyTalk 8 is not receiving any further updates. I use the Windows version all the time and it is a very stable product for me. It also is very easy to use so you can produce final projects in one sitting rather than days that would be required in more complex software.