Resolves the error which occurs when calling setup-matlab twice in single workflow

.github/workflows/bat.yml

@@ -89,3 +89,12 @@ jobs:
         with:
           release: ${{ matrix.release }}
           products: ${{ matrix.products }}
+      - name: Call setup MATLAB again with different release # should not error as in issue 130
+        uses: ./
+        with:
+          release: R2023b
+      - name: Check MATLAB version
+        uses: matlab-actions/run-command@v2
+        with:
+          command: matlabVer = ver('matlab'); assert(strcmp(matlabVer.Release,'(R2023b)'));
+

src/mpm.ts

@@ -4,6 +4,7 @@ import * as exec from "@actions/exec";
 import * as tc from "@actions/tool-cache";
 import {rmRF} from "@actions/io";
 import * as path from "path";
+import * as fs from 'fs';
 import * as matlab from "./matlab";
 import properties from "./properties.json";
 
@@ -37,6 +38,16 @@ export async function setup(platform: string, architecture: string): Promise<str
         return Promise.reject(Error("Unable to find runner temporary directory."));
     }
     let mpmDest = path.join(runner_temp, `mpm${ext}`);
+
+    // Delete mpm file if it exists
+    if (fs.existsSync(mpmDest)) {
+        try {
+            fs.unlinkSync(mpmDest);
+        } catch (err) {
+            return Promise.reject(Error(`Failed to delete existing mpm file: ${err}`));
+        }
+    }
+
     let mpm: string = await tc.downloadTool(mpmUrl, mpmDest);
 
     if (platform !== "win32") {