diff --git a/AGENTS.md b/AGENTS.md
index d7258a4..7d5a4e4 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -91,6 +91,11 @@ Current behavior:
 
 Do not manually hardcode release versions in the committed `meta.lsx` for each release if CI can derive them from tags.
 
+Release preparation rule:
+
+- before creating a release tag, run `scripts/set-version.ps1 -VersionTag <tag>` to update repository `Mods/DnD 5.5e AIO Russian/meta.lsx`
+- only after that commit the change and create/push the release tag
+
 ## info.json Expectations
 
 `info.json` is generated during build and should remain aligned with BG3/BG3ModManager expectations.
diff --git a/scripts/set-version.ps1 b/scripts/set-version.ps1
new file mode 100644
index 0000000..765c29c
--- /dev/null
+++ b/scripts/set-version.ps1
@@ -0,0 +1,49 @@
+param(
+    [Parameter(Mandatory = $true)]
+    [string]$VersionTag,
+    [string]$MetaPath = "Mods/DnD 5.5e AIO Russian/meta.lsx"
+)
+
+$ErrorActionPreference = "Stop"
+
+function Convert-VersionTagToVersion64 {
+    param(
+        [string]$Tag
+    )
+
+    $normalized = $Tag
+    if ($normalized.StartsWith("v")) {
+        $normalized = $normalized.Substring(1)
+    }
+
+    if ($normalized -notmatch '^\d+(\.\d+){0,3}$') {
+        throw "Version tag '$Tag' is invalid. Expected format: vX.Y.Z or X.Y.Z"
+    }
+
+    $parts = $normalized.Split(".")
+    $numbers = @(0, 0, 0, 0)
+    for ($i = 0; $i -lt $parts.Length; $i++) {
+        $numbers[$i] = [int]$parts[$i]
+    }
+
+    return ([int64]$numbers[0] -shl 55) -bor ([int64]$numbers[1] -shl 47) -bor ([int64]$numbers[2] -shl 31) -bor [int64]$numbers[3]
+}
+
+$resolvedMetaPath = [System.IO.Path]::GetFullPath($MetaPath)
+if (-not (Test-Path -LiteralPath $resolvedMetaPath)) {
+    throw "meta.lsx was not found: '$resolvedMetaPath'."
+}
+
+$resolvedVersion64 = Convert-VersionTagToVersion64 -Tag $VersionTag
+$metaContent = Get-Content -LiteralPath $resolvedMetaPath -Raw
+
+$versionPattern = '(<attribute id="Version64" type="int64" value=")\d+("/>)'
+if ($metaContent -notmatch $versionPattern) {
+    throw "Version64 attributes were not found in '$resolvedMetaPath'."
+}
+$updatedMeta = $metaContent -replace $versionPattern, "`${1}$resolvedVersion64`${2}"
+
+$utf8Bom = New-Object System.Text.UTF8Encoding($true)
+[System.IO.File]::WriteAllText($resolvedMetaPath, $updatedMeta, $utf8Bom)
+
+Write-Host "[set-version.ps1] Updated '$resolvedMetaPath' to Version64=$resolvedVersion64 (from tag '$VersionTag')."