You must have ProMods Europe v2.62 installed and activated.
Ensure you are using the version of the Ireland Add-On specifically released for the 1.45/2.62 cycle (often labeled as v0.1.0 or v0.1.1). 2. Key Features in the 1.45 Add-On Ireland Map Promods Addon 1.45
Introduces Tuam and refreshes existing ProMods cities. You must have ProMods Europe v2