Create a randomizer, and add two groups under it. Keep 1 in the randomly present box and check evenly present checkbox. Under first group - add embedded data (order) and set value as 1, add manipulation block 1 and then manipulation block 2. Similarly under second group - add embedded data (order) and set value as 2, add manipulation block 2 and then manipulation block 1.

So you meen i have to copy the manipulation and questions so it will be shown twice- once in the firs order condition, and once again in the second order condition. That will take a lot of time because I have 15 block in each condition, and it will be complicated to understand when the data will be exported. But if this is the only way ill do it.
thanks!

No, In the survey you will have only one set of blocks for manipulation 1 and manipulation 2. You just need to repeat it in the survey flow, i.e. just add a block element in the survey flow and from drop down choose the required block. (else the data will be present at different columns in data and analysis)

ok thank you so much!