Hi,
If you install the missing actions in your project, nothing will be lost, but they need to be the exact actions you used prior missing them.
If you are missing SimpleSql relates actions, then you need to get them again ( I am not sure how it works with SimpleSql, I don't own this), Please contact the author or let me know if you still struggle I'll contact the author.
If you are missing non SimpleSql Actions, can you list the ones you miss?
Bye,
Jean