[Lazarus] Changing package versions

[Werner Pamler]

My development system for fpspreadsheet is Lazarus 1.2.6 and, of course, 
the trunk version of fpspreadsheet (version 1.5). Sometimes, however, I 
have to switch to the released versions, e.g. 1.4.1, and this appears to 
be very confusing to me.

Here is what I am doing
- Initially, fpspreadsheet v1.5 is installed.
- "Packages" / "Install/Uninstall packages" --> select 
"laz_fpspreadsheet_visual" and "laz_fpspreadsheetexport_visual", 
"Uninstall selection", "Save and rebuild IDE"
- "Packages" / "Open package file": navigate to folder with 
fpspreadsheet v1.4.1. Open each package file and install. At the end, 
recompile IDE.
- When Lazarus comes back after building and I open the 
"Install/Uninstall packages" again, I'd expect to see versions 1.4.1, 
but I see version 1.5 again.
- I tried several "recompile clean" etc. No effect, still version 1.5.

Looking at the packagefiles.xml in my user profile I see that both 
versions are listed. After deleting the entries of version 1.5 and 
rebuilding, I finally see version 1.4.1 in the "Install/Uninstall 
packages" list.

Is it really so complicated? Or am I doing something wrong?