You or your IT staff can reference the installation steps here: https://www.blackbaud.com/files/support/guides/microedge/gifts/gifts67_installationguide.pdf
Please note: We highly advise you do not uninstall any version of GIFTS to perform the downgrade.
You will need to set up GIFTS in another server location and then re-run workstation installs for users who are using a client-server environment. For Single User installs of GIFTS 6.7.1, please set up another folder for GIFTS 6.7 and direct your gifts.ini to the GIFTS 6.7 install.
Once the installation is complete, migrate your files to the GIFTS 6.7 location so you may retain your data in the new environment.
At this time you should now be able to open your budget year and use GIFTS as normal.