Please check the following issues:
Make sure you have the correct version installed.
E.g. To see which Snagit version you have, go to the Help tab then select "About Snagit". Please see image below:
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Make sure that you have the correct license key and that you "Copy" and "Paste" your key.
Do "NOT" type it in to avoid errors.
To Copy: Highlight your license key and press CTRL + C
To Paste: Go to the location you need to enter your license key and press CTRL +V
Make sure there are no empty spaces at the beginning or end of the key.
12345-ABCDE-67890-FGHIJ-12ZXC - no empty spaces
If you still receive errors, please let us know the exact error message, and if possible send us a screen shot.
Make sure you have the correct version installed.
E.g. To see which Snagit version you have, go to the Help tab then select "About Snagit". Please see image below:

Make sure that you have the correct license key and that you "Copy" and "Paste" your key.
Do "NOT" type it in to avoid errors.
To Copy: Highlight your license key and press CTRL + C
To Paste: Go to the location you need to enter your license key and press CTRL +V
Make sure there are no empty spaces at the beginning or end of the key.
12345-ABCDE-67890-FGHIJ-12ZXC - no empty spaces
If you still receive errors, please let us know the exact error message, and if possible send us a screen shot.