Am 28.05.2019 um 10:40 schrieb Bo Berglund via lazarus:
Right now I have the following installed in my Win7 x64 environment:
Lazarus 1.6
Lazarus 1.8
Lazarus 1.8.4 32 bit
Lazarus 2.0.0 32 bit
Lazarus 2.0.0 64 bit
All of these have internbal fpc directories containing the
correspondiing fpc compiler files.
The same with me (plus some more, in particular trunk installations for
Lazarus and fpc). This is indispensable for testing when your code
should not be tied to the newest IDE version.
Normally, it is no problem to switch between different versions. But be
aware: When loading an project in a new version may change the project
in a way that it is not readable by the old version again. Laz 2.0, for
example, can add the line "Application.Scaled" to the project unit when
you use the High-dpi features - this is a problem for 1.6. (You may
enclose the line by an $IFDEF which helps for some time, but after some
changes the IDE is very persistent and adds the line again). Or Lazarus
trunk introduces a new file structure, you must save every new project
with checed "Maximize compatibility of project files" in "Project
options" > "Miscellaneous"; otherwise the project will have no files in
Laz 2.0.2 or older.
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