diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
index 918ac0f87..5a01c9642 100644
--- a/CHANGELOG.adoc
+++ b/CHANGELOG.adoc
@@ -4,6 +4,8 @@ This file documents all notable changes to https://github.com/devonfw/IDEasy[IDE
 
 == 2026.07.002
 
+* https://github.com/devonfw/IDEasy/issues/2102[#2102]: Make context.getIdeRoot() consistent during initial install
+
 Release with new features and bugfixes:
 
 
diff --git a/cli/src/main/java/com/devonfw/tools/ide/context/AbstractIdeContext.java b/cli/src/main/java/com/devonfw/tools/ide/context/AbstractIdeContext.java
index dac769796..fbd560518 100644
--- a/cli/src/main/java/com/devonfw/tools/ide/context/AbstractIdeContext.java
+++ b/cli/src/main/java/com/devonfw/tools/ide/context/AbstractIdeContext.java
@@ -111,7 +111,7 @@ public abstract class AbstractIdeContext implements IdeContext, IdeLogArgFormatt
 
   private Path ideHome;
 
-  private final Path ideRoot;
+  private Path ideRoot;
 
   private Path confPath;
 
@@ -587,6 +587,12 @@ public Path getIdeRoot() {
     return this.ideRoot;
   }
 
+  @Override
+  public void setIdeRoot(Path ideRoot) {
+
+    this.ideRoot = ideRoot;
+  }
+
   @Override
   public Path getIdePath() {
 
diff --git a/cli/src/main/java/com/devonfw/tools/ide/context/IdeContext.java b/cli/src/main/java/com/devonfw/tools/ide/context/IdeContext.java
index e8279c717..c058b7373 100644
--- a/cli/src/main/java/com/devonfw/tools/ide/context/IdeContext.java
+++ b/cli/src/main/java/com/devonfw/tools/ide/context/IdeContext.java
@@ -51,7 +51,7 @@
  * <li>{@link #getGitContext() git context} (for git operations like clone, fetch, pull, etc.)</li>
  * <li>{@link #getSystemInfo() system info} (for information about OS and CPU architecture)</li>
  * <li>{@link #getVariables() environment variables} (to access and modify IDEasy variables according to our configuration layout)</li>
- * 
+ *
  * <li>{@link #question(Object[], String, Object...) question} (for interaction to let the end-user decide)</li>
  * <li>{@link #getUrls() url metadata} (access ide-urls to find versions, download URLs, dependency and security metadata)</li>
  * <li>{@link #getDefaultToolRepository() tool repository} (for abstraction of version resolution and download of tools)</li>
@@ -409,6 +409,13 @@ default void requireOnline(String purpose, boolean explicitOnlineCheck) {
    */
   Path getIdeRoot();
 
+  /**
+   * @param ideRoot the new value of {@link #getIdeRoot() IDE_ROOT}. Typically detected automatically from the environment and working directory, but may need
+   *     to be set explicitly (e.g. during the initial installation where the {@code IDE_ROOT} environment variable is not yet available but the install target
+   *     is already known).
+   */
+  void setIdeRoot(Path ideRoot);
+
   /**
    * @return the {@link Path} to the {@link #FOLDER_UNDERSCORE_IDE}.
    * @see #getIdeRoot()
diff --git a/cli/src/main/java/com/devonfw/tools/ide/tool/IdeasyCommandlet.java b/cli/src/main/java/com/devonfw/tools/ide/tool/IdeasyCommandlet.java
index a762cd2c2..7f0683425 100644
--- a/cli/src/main/java/com/devonfw/tools/ide/tool/IdeasyCommandlet.java
+++ b/cli/src/main/java/com/devonfw/tools/ide/tool/IdeasyCommandlet.java
@@ -266,6 +266,9 @@ private boolean isSameSnapshotVersion(String installed, String latest) {
    */
   public void installIdeasy(Path cwd) {
     Path ideRoot = determineIdeRoot(cwd);
+    // During a fresh (MSI) installation the IDE_ROOT environment variable is not yet available, so context.getIdeRoot() would return null for the whole run.
+    // The install target is already known here, so we make the context consistent for any downstream code reading context.getIdeRoot() (see #1517).
+    this.context.setIdeRoot(ideRoot);
     Path idePath = ideRoot.resolve(IdeContext.FOLDER_UNDERSCORE_IDE);
     Path installationPath = idePath.resolve(IdeContext.FOLDER_INSTALLATION);
     Path ideasySoftwarePath = idePath.resolve(IdeContext.FOLDER_SOFTWARE).resolve(MvnRepository.ID).resolve(IdeasyCommandlet.TOOL_NAME)
diff --git a/cli/src/test/java/com/devonfw/tools/ide/context/AbstractIdeTestContext.java b/cli/src/test/java/com/devonfw/tools/ide/context/AbstractIdeTestContext.java
index 84022d2a0..5928b3b55 100644
--- a/cli/src/test/java/com/devonfw/tools/ide/context/AbstractIdeTestContext.java
+++ b/cli/src/test/java/com/devonfw/tools/ide/context/AbstractIdeTestContext.java
@@ -55,10 +55,6 @@ public class AbstractIdeTestContext extends AbstractIdeContext {
 
   private TestCommandletManager testCommandletManager;
 
-  private Path ideRoot;
-
-  private boolean ideRootSet;
-
   private Path urlsPath;
 
   protected final WireMockRuntimeInfo wireMockRuntimeInfo;
@@ -299,24 +295,6 @@ public void setUserHome(Path dummyUserHome) {
     super.setUserHome(dummyUserHome);
   }
 
-  @Override
-  public Path getIdeRoot() {
-
-    if (this.ideRootSet) {
-      return this.ideRoot;
-    }
-    return super.getIdeRoot();
-  }
-
-  /**
-   * @param ideRoot the new value of {@link #getIdeRoot()}.
-   */
-  public void setIdeRoot(Path ideRoot) {
-
-    this.ideRoot = ideRoot;
-    this.ideRootSet = true;
-  }
-
   @Override
   public Path getUrlsPath() {
 
diff --git a/cli/src/test/java/com/devonfw/tools/ide/tool/IdeasyCommandletTest.java b/cli/src/test/java/com/devonfw/tools/ide/tool/IdeasyCommandletTest.java
index 945e7fc19..487dcefab 100644
--- a/cli/src/test/java/com/devonfw/tools/ide/tool/IdeasyCommandletTest.java
+++ b/cli/src/test/java/com/devonfw/tools/ide/tool/IdeasyCommandletTest.java
@@ -114,6 +114,35 @@ void testInstallIdeasy(String os) {
         + addedRcLines);
   }
 
+  /**
+   * Test that {@link IdeasyCommandlet#installIdeasy(Path)} updates {@link IdeContext#getIdeRoot()} to the derived install target when {@code IDE_ROOT} is not
+   * set in the environment (as is the case during a fresh MSI installation). This ensures downstream code reading {@link IdeContext#getIdeRoot()} during the
+   * same install run gets a consistent value. See <a href="https://github.com/devonfw/IDEasy/issues/1517">#1517</a> for reference.
+   *
+   * @param os to use
+   */
+  @ParameterizedTest
+  @ValueSource(strings = { "windows", "mac", "linux" })
+  void testInstallIdeasyUpdatesIdeRoot(String os) {
+
+    // arrange
+    SystemInfo systemInfo = SystemInfoMock.of(os);
+    IdeTestContext context = newContext("install");
+    context.setIdeRoot(null);
+    context.setSystemInfo(systemInfo);
+    context.getStartContext().setForceMode(true);
+    Path gitconfigPath = context.getUserHome().resolve(".gitconfig");
+    FileAccess fileAccess = new FileAccessImpl(context);
+    fileAccess.writeFileContent("", gitconfigPath);
+    Path ideRoot = context.getUserHome().resolve("projects");
+    IdeasyCommandlet ideasy = new IdeasyCommandlet(context);
+    assertThat(context.getIdeRoot()).as("IDE_ROOT is not set before install").isNull();
+    // act
+    ideasy.installIdeasy(context.getUserHome().resolve("Downloads/ide-cli"));
+    // assert
+    assertThat(context.getIdeRoot()).isEqualTo(ideRoot);
+  }
+
   /**
    * Test of {@link IdeasyCommandlet#configureWindowsTerminalGitBash()}, also when {@code IDE_ROOT} is not yet set, as is the case during MSI installation.
    *