Heroes 5.5 WarGame Edition - Tactical Edition.

Shouldn't a link to an executable file lead to a .pak file, which contains the same files as Wargame Tactics 2.0 alfa.pak?

No. When updating the versions, I mistakenly uploaded the alpha pack there.
Now I've fixed it; the executable should be available.

Added 4 hours 37 minutes ago
Final future changes to magic (including those mentioned above):

Summoning Magic:

3 Mines = 2 x (SP + 6), 4/6/8/10 turns: reduced damage by 6 (-3) and reduced cost from 5 to 3 mana
5 Phantom = clone up to tier 1/3/5/7, starting turn 40% + 2% x hero level (duels 60%): reduced available tiers (except for expert), increased cost from 3 to 5 mana
With the new mechanic, incorporeality causes misses in 2/3 of cases - it will hit exactly every third attack, i.e., the phantom consistently survives exactly 3 hits (instead of 1-3 with the old incorporeality).

Magic of Light:

0 Dodge = 67% protection from ranged attacks for 2/4/6/8 turns (overall - on all): increased from 60%

1 Stone Skin = +(SP + 5) to defense for 1/2/3/4 turns (area of effect - 4x4): increased by +1
2 Righteous Might = +(SP + 5) to attack for 1/2/3/4 turns (area of effect - 4x4): increased by +1

3 Haste = +10% x (SP + 5) to initiative for 1/2/3/4 turns (area of effect - 4x4): increased by +1

Magic of Darkness:

0 Confusion = 50% of creatures do not shoot and do not respond to attacks for 1/2/3/4 turns (overall - on all): weakened from 60%

1 Weakness = -(SP + 5) to attack for 2/4/6/8 turns (area of effect - 4x4): increased by +1

3 Slow = -67% to initiative for 2/4/6/8 turns (area of effect - 4x4): increased from 60%

6 Blind = 2/3/4/5 turns, on expert, the enemy does not respond to the attack: now the duration does not depend on the spell
10 Berserk = attack the nearest target with (10 x SP) % damage (always for 1 turn): damage weakened and now depends on the spell (but in the future, with SP > 10, the spell is strengthened)

15 Dominate = (10 x SP) % initiative + control for 0.5 / 1 / 1.5 / 2 turns, on expert, you can target tier 7 creatures: now initiative depends on the spell, and duration - only on the skill

Light + Summoning:

4 Regeneration (Light) = 10% x (SP + 3) creatures, duration 1/2/3/4 turns: increased by 30% (+3)

Chaos + Light:

12 Holy Word (Light) = 1/2/3/4 x (SP + 5): weakened by -1/2/3/4 (-1)

Light + Darkness:

4 Grief (Darkness) = -(SP + 3) to luck and morale for 2/4/6/8 turns: now the effect depends on the spell, and the duration - on the skill (this does not apply to the Grief attack of undead dragons)
8 Vampirism (Light) = 100% vampirism and undead for 1/2/3/4 turns: duration reduced by half

Blind, Dominate, Grief are brought to a single standard: duration depends only on the skill, effect - only on the spell (if it depends).

Added 18 hours 50 minutes ago
Mod updated (links in the topic header).