Open unity project with latest version

[muazzissnajmi]

Hi all,

I just wan to ask a newbie question,
what if I open a project (older version) with unity editor (latest version),
is there will be an error or no ?

Thank You

[fffMalzbier]

Depends on how old the version is and what was used in that project.
You should give it a try.
Make sure you have a backup before trying to upgrade the project version.

[muazzissnajmi]

@fffMalzbier

Depends on how old the version is and what was used in that project.
You should give it a try.
Make sure you have a backup before trying to upgrade the project version.

what if I project is unity version 5, and I open it with latest version ?

[Joe-Censored]

@muazzissnajmi

what if I project is unity version 5, and I open it with latest version ?

Any API’s you are using that were removed between Unity 5 and your new version will either be automatically changed (occasionally Unity builds in an auto-conversion script, but not always) or will generate code errors and require you to manually change or remove before your project can successfully compile. This happens when API’s are deprecated, supported platforms change, etc. For example, you might have scripts that reference the old WebPlayer (replaced by WebGL), the legacy particle system (replaced by a new particle system), or the legacy network system (replaced by Unet, which is also now deprecated).

There may also be more subtle changes that affect your project, such as the order of your object’s Update methods being called may change which actually exposes a bug in your own code (that happened to me between 2018.2 and 2018.2.9, which exposed a minor bug in my camera script, when I really should have been using LateUpdate instead of Update).

Lastly, Unity does their best to catch any bugs, but there is no guarantee there isn’t one that affects your project until Unity releases a new version with the fix. You may need to research or figure out work arounds if any bug is affecting code or features you are specifically using.

So again, it entirely depends on how old the version is (will be a lot less work for you if you are coming from 5.6 instead of 5.0) and what exactly you are using in your project. Once a new version of Unity converts it to the new version, you generally cannot go back, so make a backup first.

[muazzissnajmi]

@Joe-Censored

Any API’s you are using that were removed between Unity 5 and your new version will either be automatically changed (occasionally Unity builds in an auto-conversion script, but not always) or will generate code errors and require you to manually change or remove before your project can successfully compile. This happens when API’s are deprecated, supported platforms change, etc. For example, you might have scripts that reference the old WebPlayer (replaced by WebGL), the legacy particle system (replaced by a new particle system), or the legacy network system (replaced by Unet, which is also now deprecated).

There may also be more subtle changes that affect your project, such as the order of your object’s Update methods being called may change which actually exposes a bug in your own code (that happened to me between 2018.2 and 2018.2.9, which exposed a minor bug in my camera script, when I really should have been using LateUpdate instead of Update).

Lastly, Unity does their best to catch any bugs, but there is no guarantee doesn’t have its own yet to be fixed bugs that affect your project until Unity releases a new version with the fix. You may need to research or figure out work arounds if any bug is affecting code or features you are specifically using.

So again, it entirely depends on how old the version is (will be a lot less work for you if you are coming from 5.6 instead of 5.0) and what exactly you are using in your project. Once a new version of Unity converts it to the new version, you generally cannot go back, so make a backup first.

thanks a lot bro, noted.