Hi,
Im trying to launch projection master but after i click drop now i get this error message:
Zscript note: interface item could not be found.
Script: ProjectionMaster.txt
Error:Texture:inventory:width
In: (IGet,texture:inventory:width)
What should i do?
Get the update.
Mine does this too and according to the updater my ZBrush is up to date.
My zbrush is up to date also 
Is there anything i could do or just try and re-install?
I just installed it a few weeks ago the first time.
This is a known issue which will be addressed in a future update. For projection painting you can use ZAppLink or PaintStop instead. For deformation you will have to wait for the update (or use ZBrush 4R4 if you have that installed).
Thank you 