You don't have to buy anything if you already have a Full version of meprog.

meProg is the Gui for the programmer hardware such as the U2-USB or EPIC programmers.
It's not part of PicBasic Pro.

If you use the version that came with your programmer, you won't have to deal with the Splash screen.
You'll just need to point MicroCode Studio to that version.
View > Compile and Program Options > Programmer tab > Edit button

Or:

In MicroCode Studio, there are four compile buttons.
  1. Compile Only - F9
  2. Compile and Program - F10
  3. ICD compile
  4. ICD Compile and Program
If you use Compile Only (F9), it will not try to open meProg everytime you compile.
When you are ready to program, press F11 then OK the splash screen once.