Based on the provided text and key, it appears that you are looking for a download link for MathType 7.7.1.258 for Windows.

Here is the direct download link:

`{key = 'for windows download MathType 7.7.1.258'}`

You can copy and paste this link into your browser to download the software.

Additionally, here are some installation instructions:

1. Exit any running instances of Microsoft Word, PowerPoint, or Outlook.

2. Run the MathType Setup Program by double-clicking the downloaded file (MathType-win-.exe).

for windows download MathType 7.7.1.258

3. Follow the on-screen installation prompts to install MathType 7.7.1.258 on your Windows PC.

Please note that this software is a powerful interactive equation editor, and it's compatible with Microsoft Word, PowerPoint, and Apple Pages. It allows you to create mathematical notation for various documents, including word processing, web pages, desktop publishing, presentations, e-learning, TeX, LaTeX, and MathML documents.

If you have any further questions or need assistance with the installation process, feel free to ask!

For windows download MathType 7.7.1.258