Last months I used Mulab 8.7.6 to make some projects. I read about the temporary free keys, and I liked to give it a try. It was nice using the software. No big problems arose and the interface is great to work with.
My suggestion for this kind of "trial period" of the software is to not to let it end at an unexpected moment. This week I suddenly couldn't finish my latest project because of an expired key.
If software does something unexpected and it is a bug, and people work on it... I don't have to lose my confidence.. But I have my doubts about software that's intended to do unexpected things...
Nevertheless, success with your reopened business!
