Sorry, we can only support the most recent version of FileZilla.
Fair enough; your product, your rules.
(Although, I was not expecting support from developers, I was expecting a suggestion from a fellow user. Isn't that, by far, the most common MO of forums such as this one?).
With that, may i rephrase the question...:
Right now I use an older version of FileZilla, the one that happens to be in the current repository of one of the most popular Linux distros.
FileZilla stores my data entered in program's Site Manager in a directory manufactured by appending $HOME with ".config/filezilla/" and ".putty/". In order to have this data written to a different place in my file hierarchy, I must execute the program in a transient shell with the $HOME environment variable pointing to the directory of my choice, e.g., ... $HOME=/home/userxyx_portable/filezilla ...
So the question is
: when I (or repository maintainer) change the program version to the most recent one, should I expect the same behaviour?
Some concluding remarks:
1) All application developers would like all their users to "upgrade" to their most recent version the day after it has been published. This is a highly naive expectation.
2) Forcing a user to jump through the hoops in order to have his or her data written in a directory of their choice is not exactly a pinnacle of software engineering.
3) I do have a sincere admiration for application developers that make their product available on all three major personal computer OS-es.