importing asset package failed

Unity Engine
1

Just bought from asset store within 3.5. (rocks fromMichael O.)

After buying download didn’t start automatically.

After downloading manually I tried to import the package

but got the message “importing package failed”

Should I install 3.4 again?

2

Do you have enough space on HDD?

3

Yes, have over 30 gb

4

Went back to 3.4.2 - imported without any errors

5

Made a new separate installation of 3.5. Now I could import the package but getting one compile error:

Assets/Standard Assets/Image Effects (Pro Only)/DepthOfFieldHdr.js(52,30): BCE0023: No appropriate version of ‘PostEffectsBase.CheckSupport’ for the argument list ‘(boolean, boolean)’ was found.

Cann anybody tell me what I need to correct here?