I need some old deprecated options from an old package (biblatex: local maxbibnames, version 1.5 (current 2.4)). So I do not want to mess up my texlive installation. How can I use an old package locally just for one document? I guess putting the .sty files is insufficent, as e.g. biblatex is supposed to be installed in a texmf folder and its archive contains a lot of other files.
You can place the old style/class files in the same directory/folder as your document. (You should probably create a single directory for this project.) If there is e.g. a
If you need to have a whole directory tree, then you can place the files in a subdirectory
or modify your configuration via Joseph's Wrights answer to how add extra searchable directories.