Installed 4.5 today to my win 7 x86_64. It works great after install,
package update and update. Thanks for all people who worked on
this. Such a relief to see it being 64 bit.

But it presents me with another update and when applied before
package update it does the update and crashes after that on start. Error
log told me it cannot resolve the framework class.

If the second update is applied after package update it fails, keeping
designer operational as well. So I settled for this

Hopefully the update mystery will be solved too.