First, you should click on the install link for our most recent version. It can be found on AppExchange, but to make life easy we’ve also provide the link here:  
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GetAccept 2.101.0 - https://login.salesforce.com/packaging/installPackage.apexp?p0=04tJ5000000t0cE
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Please note that if you are updating from an earlier version of the integration that significant changes have been made to the first two steps of the sending flow. A quick overview of the new sending flow for contracts can be viewed here.
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Once you’ve clicked on the link and logged into to your target Salesforce org, you can select “Install for all users” and click Upgrade. All existing data generated by GetAccept will remain untouched.

You will then see the upgrade in progress. "Upgrading and granting access to all Users...". This can potentially take two to three minutes.

The upgrade will then notify you when it is complete.

Finally, depending on what version you previously had installed, you may have to grant additional permissions to the users of Salesforce that will be using GetAccept. If you have already granted these permissions, it's still nice to check that everything is correctly configured. The two permissions you will need to check are as follows:

Navigate to Setup | App builder | GetAccept Admin and click edit. Remove any profiles that may currently have access to the app.

Next, proceed to assign the GetAccept Integration Admin permission set to any user you wish to have access to this app.

Finally, because this app uses reporting charts, you must also grant share access to any user to the specific GetAccept Reports folder.