Run the update installer or file-copy step as Administrator . Gaussian traditionally installs to C:\Program Files\Gaussian , which is protected by UAC.
%chk=ver.chk #p HF/3-21G test Verification gaussian 16w download upd
No. Checkpoint files ( .chk ) remain compatible across minor updates. Major revisions (e.g., Rev A.03 to Rev B.01) may break compatibility – restart jobs from the last .rwf or reformat .chk files. Run the update installer or file-copy step as Administrator