Install

Install ModelxcelPro on Excel for Windows.

Five minutes from download to first signed cell. The installer ships in your trial email; this page is the reference for system requirements and troubleshooting.

Windows · Excel 2016 and laterMac not supported

System requirements

What you need.

Operating system

Windows 10 / 11 (64-bit)

Windows Server 2019+ also supported. Mac OS is not supported — see the FAQ below.

Microsoft Excel

2016 / 2019 / 2021 / Microsoft 365 (current)

Both perpetual and Microsoft 365 (subscription) editions of Excel are supported. 32-bit and 64-bit Excel both work.

.NET runtime

.NET Framework 4.8.1

Pre-installed on Windows 10 (since 19H1) and Windows 11. The installer detects and prompts if missing.

Disk & memory

~120 MB disk · 4 GB+ RAM recommended

Memory headroom matters most for Worksheet Map and Risk Heatmap on workbooks above 200k cells.

Install steps

Five minutes from zero.

  1. 01

    Download the installer

    Your trial email includes a signed installer link. The installer ships as a .exe with an embedded VSTO manifest. (Public installer link arrives with M3 commerce launch.)

  2. 02

    Close Excel

    The installer registers a new VSTO manifest with Excel. If Excel is open, you\'ll be prompted to close it.

  3. 03

    Run the installer

    The installer is signed by ModelXcel; you\'ll see the publisher name in the Windows User Account Control prompt. Default install path: %LocalAppData%\ModelxcelPro. No admin rights required for per-user installs.

  4. 04

    Open Excel and activate

    A new ModelXcel Pro tab appears in the ribbon with eight groups: Format, Formula Tools, Name Conversion, Map, Compare, Audit, Proof, and Help. Click License Status in the Help group and paste your .lic file from the trial email.

  5. 05

    First-run tour

    A one-time welcome dialog walks through Smart Format, Proof, and Compare with a bundled Welcome.xlsx sample. From there: try Ctrl+Shift+J on a number to format it, or click any cell and hit Ctrl+Shift+I to open TrustLens.

For IT teams

License file format.

Each .lic file is a signed JSON document that your add-in validates offline against a baked-in public key. No phone-home is required for activation.

modelxcelpro.lic (excerpt)
{
  "schema": "modelxcelpro.license/v2",
  "licenseId": "lic_K7Fz9qPwU3",
  "userEmail": "ana@example.com",
  "plan": "team",
  "seatCount": 5,
  "issuedAt": "2026-05-09T14:00:00Z",
  "expiresAt": "2027-05-09T14:00:00Z",
  "publicKey": "ed25519:RkwLp…tXz4",
  "signature": "5c1f…a3e9"
}

The optional online revocation check pings /api/license/validate once per Excel session with a 14-day cache; network failure does not block activation. Enterprise deployments can disable the online check entirely via Group Policy / registry.

Troubleshooting

Common install issues.

  • The ModelXcel Pro tab doesn\'t appear in the ribbon

    Open File → Options → Add-ins. At the bottom, change "Manage" to COM Add-ins and click Go. Tick "ModelxcelPro" and click OK. If ModelxcelPro is missing from the list, the install didn\'t complete; re-run the installer with Excel closed.

  • "Cannot load this add-in" error on Excel startup

    Usually means your .NET Framework is below 4.8.1. Run Windows Update or download .NET Framework 4.8.1 from Microsoft directly. Restart Excel after install.

  • License file rejected

    Re-download from your trial email; license files are tied to the email address that requested them. If still rejected, generate a fresh license from your account portal ( /account/license → Regenerate) and try again. Rate-limited to one regeneration per 24 hours.

  • Conflicts with other add-ins

    ModelxcelPro doesn\'t hijack global Excel shortcuts. Both can be installed simultaneously. If a keyboard shortcut overlaps with another add-in, you can rebind ModelxcelPro shortcuts from Format → Settings → Keyboard.

  • Excel for Mac

    ModelxcelPro is built on .NET Framework 4.8.1 (VSTO) which Excel for Mac doesn\'t support. We don\'t plan to port until a clean cross-platform path exists. If Mac support is critical, talk to us about Enterprise — we may have an alternative for specific workflows.

  • Where are my diagnostic logs?

    ModelxcelPro writes a daily-rotated log to %LOCALAPPDATA%\ModelxcelPro\Logs\modelxcelpro-YYYYMMDD.log. Crashes go to %LOCALAPPDATA%\ModelxcelPro\crash.log (append-only). When opening a support ticket at support@modelxcel.com, attach the most recent daily log file — it dramatically speeds up diagnosis. Logs contain command names, durations, and error messages only; they never contain formula contents, cell values, file names, or workbook content.