Problems updating to Unity 2018 (Solved)

[madgeargames]

Hello,

Until recently we were using Unity version 5.6.4p2 (64-bit) and 2D Toolkit version 2.5.8.1, but now our game is going to be ported to consoles so we needed to upgrade Unity to Unity 2018.

So we first tried this:
1) We installed Unity version 2018.4.5f1.
2) We Updated 2D Toolkit version to 2.5.8.16.
3) We tried then to edit a spritecollection from the "2D Toolkit > Edit" new menu, but it tried to open a window, that window was blank and Unity freezed.
4) So we tried the integrity checker. It didn't work.
5) So we tried to rebuild index. It didn't work.
6) So we tried to Rebuild all sprites. It didn't work.

Then we downloaded Unity-2018.3.7f1 to try that version, but it didn't work also.

Fortunatelly we have backups of our project (we use git), but I fear we are a bit lost here, maybe we didn't follow the right steps to upgrade? Could you please tell us the correct sequence to upgrade Unity to some 2018 version and 2D Toolkit to its newer version?

Thank you for your time.

Best regards,
Mad Gear Games team.

[madgeargames]

We found the problem! We missed the resources images when importing 2D Toolkit!