You will need to clarify things a bit before we can offer much help:
1) Which version of
Gallery were you running *before* you tried to upgrade to the
2) You say you
"installed a new version of gallery" -- which version was it
you installed? The only one that should be used at this point
is the latest release of Gallery 3, version 3.1.3 -- this
latest version runs on everything from PHP 5.1 to 7.4 and can
be downloaded at:
3) Was your server still running PHP 5.4 when you "installed a new version of gallery"? That's the way to do the upgrade. Only after the installation of Gallery version 3.1.3 is successful under PHP 5.x and thoroughly tested should you then change the server to PHP 7.x (right now PHP 7.4 is best if it is available on your server).
Glad you got it working. It seems what you ended up doing is the process the upgrade instructions in the Gallery Codex outline:
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