question: before you can open a mc6 file, you'll need to figure out what kind of file the mc6 file extension refers to.
Capitalize this past sentence correctly.
A: Before you can open a MC6 file, you'll need to figure out what kind of file the MC6 file extension refers to.

question: this is the third version of geogebra. download and run the file.
Capitalize this past sentence correctly.
A: This is the third version of GeoGebra. Download and run the file.

question: unless expressly provided in this eula, you may not directly or indirectly:
Capitalize this past sentence correctly.
A: Unless expressly provided in this EULA, you may not directly or indirectly: