I am not familiar with how fixes works.
Fixes sources can be downloaded from
gitlab FPC repository fixes branchIt works exactly the same as any other FPC compiler except for the fact that some issues that appeared after the fpc 3.2.2 release were addresses.
I am on FPC 3.2.2, what would you recommend me to do if I just need this bug fixed but I cannot risk upgrading to the trunk version?
Then don't upgrade to trunk but instead install either fixes or trunk alongside your current FPC compiler.
In case you are not aware how to compiler the compiler from source (see f.e.
wiki) then it is possible to use something like
FPCUpDeluxe to do that for you (that is able to create a complete independent installation of FPC and/or Lazarus).
I did not see any reference to any platform so you would have to follow those parts that applies to/for your OS.