Greg, Lets be clear, in this case you want to move the date completely off the main computer and solely onto the lap top. It seems like there are "times" the main computer is slow and times it is not and you want to move back and forth?
Jim, if you have a separate problem then start another thread. It doesn't seem that this is a related issue. When you submit a problem give versions of the program and your OS as very helpful information. Also a more clear description of your problem.
Some people have found jumping over so many versions does not work well. They have taken the long road, version by version, installing each version in turn, using it to import there data and the moving on to the next version.
If you find you need to take the long road, old versions can be found at https://infinitekind.com/previous-versions-of-moneydance