Seriously, what is the difference between 3.8.1 and 3.11?
Wired improvements,
Bugs fixed
New things added like multiheight and stuff.
It looks better to use 3.11 rather than 3.8.1
You may want to read the OP before posting here because clearly the older emulator had a lot of classes that needed fixing and in this release they've fixed them and decided to re-release as the emulator should be filled with cleaner classes now.
And if you look at the SQL folder you see an SQL file named Fix you may want to run that as well.
Read the OP before posting it may help you in the future.