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If the authorization doesn't "stick," try running Excel as an administrator when you enter the code.
| Online Activation | Offline Activation | |-------------------|--------------------| | Click the link directly in the software. | Copy the link to a USB drive, open it on an internet-connected PC, download an .auth file. | | Instant, no files to manage. | Requires moving files between computers. | | Link expires after first use. | The .auth file is single-use but can be generated multiple times from the same link (if allowed by license). |
: Locate and click the "Authorization dialog" button at the top of the sheet.
Check your spam folder. If it hasn't arrived after 48 hours, contact support@mitcalc.com with your purchase details.
If your IT department or professor purchased a site license, they will provide you with an internal link (often a PHP script on the local network). This link points to your organizationâs license server, not the public MITCALC website.
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