Do you have any disabled DLCs? For example, "Winds of Change"?

No, Ill just have this mod and the other mod enables and it doesn't work. I tried maybe just having this mod enables, didnt work. I had tried any combination, didnt work. I tried reinstalling the mod, didn't work. I don't know what Im doing wrong.

Yes

MARINE ARTILLERY???

Have you enabled any other mods that modify the "countrymissionsview.gui" file?

Doesn't work for me. I install the other required mods but everytime I boot in the game, the mission tree is just the vanilla Venetian tree.

By having the two province needed to build the Suez canal will spawn an event that will automatically launch the great wonder canal for free, taking 10 years. Make sure you complete the canal before 1499 or you may end up getting a disaster as Venice. Maybe you need to dev the two province for the mission about them before the event pop up, not sure.

Tips :
1) Controlling Ragusa during a war (even if they are not a co-belligerent) will pop an event to white peace only them and ceding the province to you. If they are still an one province minor they will be fully annexed.
2) Controlling the Nile delta during war pop an event that cede the provinces to you and keep the war going.
3) Controlling the Geneose province in Crimea that is farthest away will pop an event that cede it to you and keep the war going.
4) There is an event if you control Constantinople, I think, but I forget what it does, I'm just sure that the war keep going after.
5) Controlling all the Morea area byzantine provinces will pop an event which give you core on them, you are going to need to annex them during peace deal however.
6) If you control Thessalanonika during a war with the Ottoman (like supporting Skanderberg) you will get an event wich give you core + cede the province to you and keep the war going.