Internet Explorer on Windows XP is not supported

All versions of Internet Explorer on Windows XP (all service pack levels) are not supported.

Workaround

On Windows XP, use Google Chrome or Mozilla Firefox.

Technical details:

Netmath uses Server Name Indication (SNI) for its Content Delivery Network (CDN)

Internet Explorer on Windows XP does not support Server Name Indication (SNI) because XP's SChannel library is too old.

Server Name Indication (SNI) reference:
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