Hello,
where can I download old versions? Sometimes the latest version od ros has many bugs and I want to downgrade.
I’m looking for 3.0rc1 for PowerPC, pls? I got RC3 a 4 and they have DNS bugs 
please try to upgrade to v3.0rc5
Downgrading will not solve the problem!
First you need to work it out yourself - try to reduce number of possibilities - try to pinpoint the problem
Then report all information to mikrotik support - don’t write long letters, keep it brief, but include all your findings.
“My DNS doesn’t work” - BAD
“When i create…and…then…or… my DNS stops” - OK
Then send all necessary information to them it might be (they will ask)
supout files
remote debug logs
network diagrams
full access to the router!!!
testing of the prerelease versions for bugfix.
I had OSPF problems in one the betas, but we manage to solve them.