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1.2.n to 1.2.m directly, you should upgrade forum step by step to version you needed. This is recommended for modded installations: the patch is able to resolve some conflicts automatically, otherwise it points out the lines it couldn't work out.
A forum is located in ~/public_html/punbb/. The forum URL is http://example.com/punbb/. The forum is using the MySQL database punbb_db with the user punbb_user and password punbb_pass. There are no mods or the modded files were not updated.
To upgrade the forum from 1.2.15 to 1.2.20 version:
cd ~/public_htmltar -czf ~/punbb.tgz punbb or download them all via FTPmysqldump -upunbb_user -ppunbb_pass punbb_db > ~/punbb_dump.sql or use other tool of your hosting providercd ~/public_htmlwget http://punbb.informer.com/download/patch/punbb-1.2.15_to_1.2.17.patch or upload it via FTPpatch -ul -d punbb -p2 < punbb-1.2.15_to_1.2.17.patchpatch -ul -d punbb -p2 < punbb-1.2.15_to_1.2.17.patch12_to_1220_update.php from extras to the root of your forum and open 12_to_1220_update.php in your browser. Remove it when the database upgrade is finished:cd ~tar xzf punbb-1.2.20.tar.gz or do this locally on your computercp extras/12_to_1220_update.php public_html/punbb/ or upload it via FTPrm public_html/punbb/12_to_1220_update.phpDone.