How do I make a "Techtree choice"?

[tdrsmynm]

Ask the title says, i want to make a techtree choice.
To make things easier to understand, Assume the following "variables":
Upgrade X - Purity
Upgrade Y - Corruption
Building X - Fountain
Building Y - Corrupted Fountain
Building Z - Upgrading or Triggering Building (Summoning Fountain)

At the start of the game, Both Building X and Y would be unavailable for construction. (This part I got using triggers)

Next step is this:
Scenario 1: You research Upgrade X which would result to:

• Upgrade Y becomes unavailable for research
• Building X becomes available for construction

Scenario 2: You research Upgrade Y which would result to:

• Upgrade X becomes unavailable for research
• Building Y becomes available for construction

Below are the triggers I used. Kindly ignore the Summoning Fountain part on the first trigger. Its irrelevant to this post.

• Swamps Initialization
  • Events
    • Map initialization
  • Conditions
  • Actions
    • Player Group - Pick every player in (All players) and do (Actions)
      • Loop - Actions
        • Player - Make Corrupted Fountain Unavailable for training/construction by (Picked player)
        • Player - Make Fountain Unavailable for training/construction by (Picked player)
        • Player - Limit training of Summoning Fountain to 5 for (Picked player)

• Corruption Fountain Availability
  • Events
    • Unit - A unit Finishes an upgrade
  • Conditions
    • (Unit-type of (Triggering unit)) Equal to Summoning Fountain
    • (Researched tech-type) Equal to Corruption
  • Actions
    • Player - Make Corrupted Fountain Available for training/construction by (Owner of (Triggering unit))
    • Player - Set the current research level of Purity to 1 for (Owner of (Triggering unit))

• Fountain Availability
  • Events
    • Unit - A unit Finishes an upgrade
  • Conditions
    • (Researched tech-type) Equal to Purity
    • (Unit-type of (Triggering unit)) Equal to Summoning Fountain
  • Actions
    • Player - Make Fountain Available for training/construction by (Owner of (Triggering unit))
    • Player - Set the current research level of Corruption to 1 for (Owner of (Triggering unit))

 

[Daffa]

You would use set max research of the disabled one to 0 instead.

As for techteee choice, I think it's already up to player to decide at this point no? Did I misunderstood something here?

 

[tdrsmynm]

You would use set max research of the disabled one to 0 instead.

I'll try this later and get back to you.

As for techteee choice, I think it's already up to player to decide at this point no? Did I misunderstood something here?

I think you did misunderstood something. What I meant here is, the player in game, would choose the techtree that they want.

EDIT: It did work, but I had to change the event to "Finishes a research".